diff --git a/package-lock.json b/package-lock.json
index 52f55e2..5f61028 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -5,22 +5,21 @@
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+      "resolved": "https://registry.npmjs.org/@babel/runtime/-/runtime-7.0.0.tgz",
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       "dev": true,
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-        "regenerator-runtime": "0.11.1"
+        "regenerator-runtime": "0.12.1"
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-      "resolved": "https://registry.npmjs.org/@types/body-parser/-/body-parser-1.16.5.tgz",
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+      "resolved": "https://registry.npmjs.org/@types/body-parser/-/body-parser-1.17.0.tgz",
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       "dev": true,
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@@ -30,6 +29,15 @@
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+      "resolved": "https://registry.npmjs.org/@types/connect/-/connect-3.4.32.tgz",
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+      "dev": true,
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@@ -100,15 +108,6 @@
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@@ -120,18 +119,18 @@
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+      "version": "0.5.4",
+      "resolved": "https://registry.npmjs.org/@types/zen-observable/-/zen-observable-0.5.4.tgz",
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-      "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.4.tgz",
-      "integrity": "sha1-hiRnWMfdbSGmR0/whKR0DsBesh8=",
+      "version": "1.3.5",
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@@ -154,33 +153,61 @@
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-      "resolved": "https://registry.npmjs.org/apollo-cache-control/-/apollo-cache-control-0.0.9.tgz",
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       "dev": true,
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+        "graphql-extensions": "0.0.10"
+      }
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+    "apollo-link": {
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+      "resolved": "https://registry.npmjs.org/apollo-link/-/apollo-link-1.2.2.tgz",
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+        "apollo-utilities": "1.0.4",
+        "zen-observable-ts": "0.8.9"
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+          "dev": true
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+          "dev": true,
+          "requires": {
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-      "integrity": "sha1-82hVo+vcLXe4ucRUOAvx1wYQX/w=",
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-        "apollo-tracing": "0.1.3",
-        "graphql-extensions": "0.0.8"
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-      "integrity": "sha1-D/ggHAvzYoBKFR4TmXZ9rmq34wk=",
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@@ -189,32 +216,32 @@
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-        "apollo-server-module-graphiql": "1.3.2"
+        "apollo-server-core": "1.4.0",
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       "dev": true,
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-      "resolved": "https://registry.npmjs.org/apollo-upload-server/-/apollo-upload-server-4.0.2.tgz",
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@@ -267,26 +294,26 @@
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-        "commander": "2.14.1",
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-      "integrity": "sha1-ctgzHpDneSsE3MoyeKezHEmkaus=",
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@@ -310,27 +337,27 @@
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@@ -358,7 +385,7 @@
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@@ -417,9 +444,9 @@
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@@ -577,19 +603,11 @@
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@@ -603,9 +621,9 @@
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-    "lodash.isobject": {
-      "version": "3.0.2",
-      "resolved": "https://registry.npmjs.org/lodash.isobject/-/lodash.isobject-3.0.2.tgz",
-      "integrity": "sha1-PI+41bW/S/kK4G4U8qUwpO2TXh0=",
-      "dev": true
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-    "lodash.isstring": {
-      "version": "4.0.1",
-      "resolved": "https://registry.npmjs.org/lodash.isstring/-/lodash.isstring-4.0.1.tgz",
-      "integrity": "sha1-1SfftUVuynzJu5XV2ur4i6VKVFE=",
-      "dev": true
-    },
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       "resolved": "https://registry.npmjs.org/make-error/-/make-error-1.3.4.tgz",
@@ -1207,18 +1271,18 @@
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-      "resolved": "https://registry.npmjs.org/mime-db/-/mime-db-1.30.0.tgz",
-      "integrity": "sha1-dMZD2i3Z1qRTmZY0ZbJtXKfXHwE=",
+      "version": "1.36.0",
+      "resolved": "https://registry.npmjs.org/mime-db/-/mime-db-1.36.0.tgz",
+      "integrity": "sha512-L+xvyD9MkoYMXb1jAmzI/lWYAxAMCPvIBSWur0PZ5nOf5euahRLVqH//FKW9mWp2lkqUgYiXPgkzfMUFi4zVDw==",
       "dev": true
     },
     "mime-types": {
-      "version": "2.1.17",
-      "resolved": "https://registry.npmjs.org/mime-types/-/mime-types-2.1.17.tgz",
-      "integrity": "sha1-Cdejk/A+mVp5+K+Fe3Cp4KsWVXo=",
+      "version": "2.1.20",
+      "resolved": "https://registry.npmjs.org/mime-types/-/mime-types-2.1.20.tgz",
+      "integrity": "sha512-HrkrPaP9vGuWbLK1B1FfgAkbqNjIuy4eHlIYnFi7kamZyLLrGlo2mpcx0bBmNpKqBtYtAfGbodDddIgddSJC2A==",
       "dev": true,
       "requires": {
-        "mime-db": "1.30.0"
+        "mime-db": "1.36.0"
       }
     },
     "minimatch": {
@@ -1266,13 +1330,9 @@
       "dev": true
     },
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-      "version": "1.7.3",
-      "resolved": "https://registry.npmjs.org/node-fetch/-/node-fetch-1.7.3.tgz",
-      "integrity": "sha512-NhZ4CsKx7cYm2vSrBAr2PvFOe6sWDf0UYLRqA6svUYg7+/TSfVAu49jYC4BvQ4Sms9SZgdqGBgroqfDhJdTyKQ==",
-      "requires": {
-        "encoding": "0.1.12",
-        "is-stream": "1.1.0"
-      }
+      "version": "2.1.2",
+      "resolved": "https://registry.next.labs.aeb.com/repository/next.npm.group/node-fetch/-/node-fetch-2.1.2.tgz",
+      "integrity": "sha1-q4hOjn5X44qUR1POxwb3iNF2i7U="
     },
     "normalize-package-data": {
       "version": "2.4.0",
@@ -1341,13 +1401,13 @@
       "dev": true
     },
     "proxy-addr": {
-      "version": "2.0.2",
-      "resolved": "https://registry.npmjs.org/proxy-addr/-/proxy-addr-2.0.2.tgz",
-      "integrity": "sha1-ZXFQT0e7mI7IGAJT+F3X4UlSvew=",
+      "version": "2.0.4",
+      "resolved": "https://registry.npmjs.org/proxy-addr/-/proxy-addr-2.0.4.tgz",
+      "integrity": "sha512-5erio2h9jp5CHGwcybmxmVqHmnCBZeewlfJ0pex+UW7Qny7OOZXTtH56TGNyBizkgiOwhJtMKrVzDTeKcySZwA==",
       "dev": true,
       "requires": {
         "forwarded": "0.1.2",
-        "ipaddr.js": "1.5.2"
+        "ipaddr.js": "1.8.0"
       }
     },
     "punycode": {
@@ -1357,9 +1417,9 @@
       "dev": true
     },
     "qs": {
-      "version": "6.5.1",
-      "resolved": "https://registry.npmjs.org/qs/-/qs-6.5.1.tgz",
-      "integrity": "sha512-eRzhrN1WSINYCDCbrz796z37LOe3m5tmW7RQf6oBntukAG1nmovJvhnwHHRMAfeoItc1m2Hk02WER2aQ/iqs+A==",
+      "version": "6.5.2",
+      "resolved": "https://registry.npmjs.org/qs/-/qs-6.5.2.tgz",
+      "integrity": "sha512-N5ZAX4/LxJmF+7wN74pUD6qAh9/wnvdQcjq9TZjevvXzSUo7bfmw91saqMjzGS2xq91/odN2dW/WOl7qQHNDGA==",
       "dev": true
     },
     "querystring": {
@@ -1375,14 +1435,14 @@
       "dev": true
     },
     "raw-body": {
-      "version": "2.3.2",
-      "resolved": "https://registry.npmjs.org/raw-body/-/raw-body-2.3.2.tgz",
-      "integrity": "sha1-vNYMd9Prk83gBQKVw/N5OJvIj4k=",
+      "version": "2.3.3",
+      "resolved": "https://registry.npmjs.org/raw-body/-/raw-body-2.3.3.tgz",
+      "integrity": "sha512-9esiElv1BrZoI3rCDuOuKCBRbuApGGaDPQfjSflGxdy4oyzqghxu6klEkkVIvBje+FF0BX9coEv8KqW6X/7njw==",
       "dev": true,
       "requires": {
         "bytes": "3.0.0",
-        "http-errors": "1.6.2",
-        "iconv-lite": "0.4.19",
+        "http-errors": "1.6.3",
+        "iconv-lite": "0.4.23",
         "unpipe": "1.0.0"
       }
     },
@@ -1420,9 +1480,9 @@
       }
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     "regenerator-runtime": {
-      "version": "0.11.1",
-      "resolved": "https://registry.npmjs.org/regenerator-runtime/-/regenerator-runtime-0.11.1.tgz",
-      "integrity": "sha512-MguG95oij0fC3QV3URf4V2SDYGJhJnJGqvIIgdECeODCT98wSWDAJ94SSuVpYQUoTcGUIL6L4yNB7j1DFFHSBg==",
+      "version": "0.12.1",
+      "resolved": "https://registry.npmjs.org/regenerator-runtime/-/regenerator-runtime-0.12.1.tgz",
+      "integrity": "sha512-odxIc1/vDlo4iZcfXqRYFj0vpXFNoGdKMAUieAlFYO6m/nl5e9KR/beGf41z4a1FI+aQgtjhuaSlDxQ0hmkrHg==",
       "dev": true
     },
     "resolve": {
@@ -1449,6 +1509,12 @@
       "integrity": "sha512-kKvNJn6Mm93gAczWVJg7wH+wGYWNrDHdWvpUmHyEsgCtIwwo3bqPtV4tR5tuPaUhTOo/kvhVwd8XwwOllGYkbg==",
       "dev": true
     },
+    "safer-buffer": {
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/safer-buffer/-/safer-buffer-2.1.2.tgz",
+      "integrity": "sha512-YZo3K82SD7Riyi0E1EQPojLz7kpepnSQI9IyPbHHg1XXXevb5dJI7tpyN2ADxGcQbHG7vcyRHk0cbwqcQriUtg==",
+      "dev": true
+    },
     "sax": {
       "version": "1.2.1",
       "resolved": "https://registry.npmjs.org/sax/-/sax-1.2.1.tgz",
@@ -1462,50 +1528,50 @@
       "dev": true
     },
     "send": {
-      "version": "0.16.1",
-      "resolved": "https://registry.npmjs.org/send/-/send-0.16.1.tgz",
-      "integrity": "sha512-ElCLJdJIKPk6ux/Hocwhk7NFHpI3pVm/IZOYWqUmoxcgeyM+MpxHHKhb8QmlJDX1pU6WrgaHBkVNm73Sv7uc2A==",
+      "version": "0.16.2",
+      "resolved": "https://registry.npmjs.org/send/-/send-0.16.2.tgz",
+      "integrity": "sha512-E64YFPUssFHEFBvpbbjr44NCLtI1AohxQ8ZSiJjQLskAdKuriYEP6VyGEsRDH8ScozGpkaX1BGvhanqCwkcEZw==",
       "dev": true,
       "requires": {
         "debug": "2.6.9",
-        "depd": "1.1.1",
+        "depd": "1.1.2",
         "destroy": "1.0.4",
-        "encodeurl": "1.0.1",
+        "encodeurl": "1.0.2",
         "escape-html": "1.0.3",
         "etag": "1.8.1",
         "fresh": "0.5.2",
-        "http-errors": "1.6.2",
+        "http-errors": "1.6.3",
         "mime": "1.4.1",
         "ms": "2.0.0",
         "on-finished": "2.3.0",
         "range-parser": "1.2.0",
-        "statuses": "1.3.1"
+        "statuses": "1.4.0"
       },
       "dependencies": {
         "statuses": {
-          "version": "1.3.1",
-          "resolved": "https://registry.npmjs.org/statuses/-/statuses-1.3.1.tgz",
-          "integrity": "sha1-+vUbnrdKrvOzrPStX2Gr8ky3uT4=",
+          "version": "1.4.0",
+          "resolved": "https://registry.npmjs.org/statuses/-/statuses-1.4.0.tgz",
+          "integrity": "sha512-zhSCtt8v2NDrRlPQpCNtw/heZLtfUDqxBM1udqikb/Hbk52LK4nQSwr10u77iopCW5LsyHpuXS0GnEc48mLeew==",
           "dev": true
         }
       }
     },
     "serve-static": {
-      "version": "1.13.1",
-      "resolved": "https://registry.npmjs.org/serve-static/-/serve-static-1.13.1.tgz",
-      "integrity": "sha512-hSMUZrsPa/I09VYFJwa627JJkNs0NrfL1Uzuup+GqHfToR2KcsXFymXSV90hoyw3M+msjFuQly+YzIH/q0MGlQ==",
+      "version": "1.13.2",
+      "resolved": "https://registry.npmjs.org/serve-static/-/serve-static-1.13.2.tgz",
+      "integrity": "sha512-p/tdJrO4U387R9oMjb1oj7qSMaMfmOyd4j9hOFoxZe2baQszgHcSWjuya/CiT5kgZZKRudHNOA0pYXOl8rQ5nw==",
       "dev": true,
       "requires": {
-        "encodeurl": "1.0.1",
+        "encodeurl": "1.0.2",
         "escape-html": "1.0.3",
         "parseurl": "1.3.2",
-        "send": "0.16.1"
+        "send": "0.16.2"
       }
     },
     "setprototypeof": {
-      "version": "1.0.3",
-      "resolved": "https://registry.npmjs.org/setprototypeof/-/setprototypeof-1.0.3.tgz",
-      "integrity": "sha1-ZlZ+NwQ+608E2RvWWMDL77VbjgQ=",
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/setprototypeof/-/setprototypeof-1.1.0.tgz",
+      "integrity": "sha512-BvE/TwpZX4FXExxOxZyRGQQv651MSwmWKZGqvmPcRIjDqWub67kTKuIMx43cZZrS/cBBzwBcNDWoFxt2XEFIpQ==",
       "dev": true
     },
     "slash": {
@@ -1567,9 +1633,9 @@
       }
     },
     "statuses": {
-      "version": "1.4.0",
-      "resolved": "https://registry.npmjs.org/statuses/-/statuses-1.4.0.tgz",
-      "integrity": "sha512-zhSCtt8v2NDrRlPQpCNtw/heZLtfUDqxBM1udqikb/Hbk52LK4nQSwr10u77iopCW5LsyHpuXS0GnEc48mLeew==",
+      "version": "1.5.0",
+      "resolved": "https://registry.npmjs.org/statuses/-/statuses-1.5.0.tgz",
+      "integrity": "sha1-Fhx9rBd2Wf2YEfQ3cfqZOBR4Yow=",
       "dev": true
     },
     "streamsearch": {
@@ -1594,19 +1660,16 @@
       }
     },
     "subscriptions-transport-ws": {
-      "version": "0.9.6",
-      "resolved": "https://registry.npmjs.org/subscriptions-transport-ws/-/subscriptions-transport-ws-0.9.6.tgz",
-      "integrity": "sha512-thbrhqkwXN7kfKM6CQHSZ0/+nEJuB4mSsW0/XO5Eth5GiTZhbxysorJ7X4XCK/HKZdjhEnyVi6F//CJnRFZmQQ==",
+      "version": "0.9.14",
+      "resolved": "https://registry.npmjs.org/subscriptions-transport-ws/-/subscriptions-transport-ws-0.9.14.tgz",
+      "integrity": "sha512-n1+mgupVdJn1MIls1ZhSJurJjc+islp7Tv9EIaEJ3HAd9DaINneKq0KRqOYNOrvUI7orVWGomEnlIxoudjfbeA==",
       "dev": true,
       "requires": {
         "backo2": "1.0.2",
-        "eventemitter3": "2.0.3",
+        "eventemitter3": "3.1.0",
         "iterall": "1.2.2",
-        "lodash.assign": "4.2.0",
-        "lodash.isobject": "3.0.2",
-        "lodash.isstring": "4.0.1",
         "symbol-observable": "1.2.0",
-        "ws": "3.3.3"
+        "ws": "5.2.2"
       }
     },
     "supports-color": {
@@ -1645,13 +1708,13 @@
       }
     },
     "type-is": {
-      "version": "1.6.15",
-      "resolved": "https://registry.npmjs.org/type-is/-/type-is-1.6.15.tgz",
-      "integrity": "sha1-yrEPtJCeRByChC6v4a1kbIGARBA=",
+      "version": "1.6.16",
+      "resolved": "https://registry.npmjs.org/type-is/-/type-is-1.6.16.tgz",
+      "integrity": "sha512-HRkVv/5qY2G6I8iab9cI7v1bOIdhm94dVjQCPFElW9W+3GeDOSHmy2EBYe4VTApuzolPcmgFTN3ftVJRKR2J9Q==",
       "dev": true,
       "requires": {
         "media-typer": "0.3.0",
-        "mime-types": "2.1.17"
+        "mime-types": "2.1.20"
       }
     },
     "typescript": {
@@ -1660,12 +1723,6 @@
       "integrity": "sha512-h6pM2f/GDchCFlldnriOhs1QHuwbnmj6/v7499eMHqPeW4V2G0elua2eIc2nu8v2NdHV0Gm+tzX83Hr6nUFjQA==",
       "dev": true
     },
-    "ultron": {
-      "version": "1.1.1",
-      "resolved": "https://registry.npmjs.org/ultron/-/ultron-1.1.1.tgz",
-      "integrity": "sha512-UIEXBNeYmKptWH6z8ZnqTeS8fV74zG0/eRU9VGkpzz+LIJNs8W/zM/L+7ctCkRrgbNnnR0xxw4bKOr0cW0N0Og==",
-      "dev": true
-    },
     "unc-path-regex": {
       "version": "0.1.2",
       "resolved": "https://registry.npmjs.org/unc-path-regex/-/unc-path-regex-0.1.2.tgz",
@@ -1728,10 +1785,9 @@
       "integrity": "sha1-DE+94C47Nx+SIgE/xmMqXEVBmyk="
     },
     "whatwg-fetch": {
-      "version": "2.0.3",
-      "resolved": "https://registry.npmjs.org/whatwg-fetch/-/whatwg-fetch-2.0.3.tgz",
-      "integrity": "sha1-nITsLc9oGH/wC8ZOEnS0QhduHIQ=",
-      "dev": true
+      "version": "2.0.4",
+      "resolved": "https://registry.next.labs.aeb.com/repository/next.npm.group/whatwg-fetch/-/whatwg-fetch-2.0.4.tgz",
+      "integrity": "sha512-dcQ1GWpOD/eEQ97k66aiEVpNnapVj90/+R+SXTPYGHpYBBypfKJEQjLrvMZ7YXbKm21gXd4NcuxUTjiv1YtLng=="
     },
     "wrappy": {
       "version": "1.0.2",
@@ -1740,34 +1796,29 @@
       "dev": true
     },
     "ws": {
-      "version": "3.3.3",
-      "resolved": "https://registry.npmjs.org/ws/-/ws-3.3.3.tgz",
-      "integrity": "sha512-nnWLa/NwZSt4KQJu51MYlCcSQ5g7INpOrOMt4XV8j4dqTXdmlUmSHQ8/oLC069ckre0fRsgfvsKwbTdtKLCDkA==",
+      "version": "5.2.2",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-5.2.2.tgz",
+      "integrity": "sha512-jaHFD6PFv6UgoIVda6qZllptQsMlDEJkTQcybzzXDYM1XO9Y8em691FGMPmM46WGyLU4z9KMgQN+qrux/nhlHA==",
       "dev": true,
       "requires": {
-        "async-limiter": "1.0.0",
-        "safe-buffer": "5.1.1",
-        "ultron": "1.1.1"
+        "async-limiter": "1.0.0"
       }
     },
     "xml2js": {
-      "version": "0.4.17",
-      "resolved": "https://registry.npmjs.org/xml2js/-/xml2js-0.4.17.tgz",
-      "integrity": "sha1-F76T6q4/O3eTWceVtBlwWogX6Gg=",
+      "version": "0.4.19",
+      "resolved": "https://registry.npmjs.org/xml2js/-/xml2js-0.4.19.tgz",
+      "integrity": "sha512-esZnJZJOiJR9wWKMyuvSE1y6Dq5LCuJanqhxslH2bxM6duahNZ+HMpCLhBQGZkbX6xRf8x1Y2eJlgt2q3qo49Q==",
       "dev": true,
       "requires": {
         "sax": "1.2.1",
-        "xmlbuilder": "4.2.1"
+        "xmlbuilder": "9.0.7"
       }
     },
     "xmlbuilder": {
-      "version": "4.2.1",
-      "resolved": "https://registry.npmjs.org/xmlbuilder/-/xmlbuilder-4.2.1.tgz",
-      "integrity": "sha1-qlijBBoGb5DqoWwvU4n/GfP0YaU=",
-      "dev": true,
-      "requires": {
-        "lodash": "4.17.4"
-      }
+      "version": "9.0.7",
+      "resolved": "https://registry.npmjs.org/xmlbuilder/-/xmlbuilder-9.0.7.tgz",
+      "integrity": "sha1-Ey7mPS7FVlxVfiD0wi35rKaGsQ0=",
+      "dev": true
     },
     "yn": {
       "version": "2.0.0",
@@ -1775,6 +1826,12 @@
       "integrity": "sha1-5a2ryKz0CPY4X8dklWhMiOavaJo=",
       "dev": true
     },
+    "zen-observable": {
+      "version": "0.8.9",
+      "resolved": "https://registry.npmjs.org/zen-observable/-/zen-observable-0.8.9.tgz",
+      "integrity": "sha512-Y9kPzjGvIZ5jchSlqlCpBW3I82zBBL4z+ulXDRVA1NwsKzjt5kwAi+gOYIy0htNkfuehGZZtP5mRXHRV6TjDWw==",
+      "dev": true
+    },
     "zen-observable-ts": {
       "version": "0.8.8",
       "resolved": "https://registry.npmjs.org/zen-observable-ts/-/zen-observable-ts-0.8.8.tgz",
diff --git a/package.json b/package.json
index 9d4697d..f6a95e8 100644
--- a/package.json
+++ b/package.json
@@ -15,6 +15,9 @@
     "type": "git",
     "url": "https://github.com/aeb-labs/graphql-weaver.git"
   },
+  "publishConfig": {
+    "registry": "https://registry.npmjs.org/"
+  },
   "author": "",
   "license": "MIT",
   "devDependencies": {
@@ -25,14 +28,13 @@
     "@types/graphql-type-json": "^0.1.2",
     "@types/jasmine": "^2.5.52",
     "@types/node": "^7.0.22",
-    "@types/node-fetch": "^1.6.7",
     "colors": "^1.1.2",
     "dependency-check": "^2.9.1",
     "fs-extra": "^3.0.1",
-    "graphql": "0.13.1",
+    "graphql": "^0.13.2",
     "graphql-tag": "^2.8.0",
     "graphql-tools": "^2.21.0",
-    "graphql-yoga": "^1.4.3",
+    "graphql-yoga": "~1.7.0",
     "jasmine": "^2.6.0",
     "jasmine-promises": "^0.4.1",
     "jasmine-spec-reporter": "^4.1.0",
@@ -47,7 +49,7 @@
     "graphql-transformer": "^0.1.5",
     "graphql-type-json": "^0.1.4",
     "line-column": "^1.0.2",
-    "node-fetch": "~1.7.0",
+    "cross-fetch": "^2.2.2",
     "trace-error": "~0.0.7"
   },
   "peerDependencies": {
diff --git a/spec/helpers/grapqhl-http-test/graphql-http-test-endpoint.ts b/spec/helpers/grapqhl-http-test/graphql-http-test-endpoint.ts
index 5350464..dad6b5c 100644
--- a/spec/helpers/grapqhl-http-test/graphql-http-test-endpoint.ts
+++ b/spec/helpers/grapqhl-http-test/graphql-http-test-endpoint.ts
@@ -7,13 +7,16 @@ export class GraphQLHTTPTestEndpoint {
 
     public async start(port: number, schema?: GraphQLSchema) {
         const server = new GraphQLServer({
-            schema: schema || defaultTestSchema
+            // graphql-yoga declares @types/graphql as regular dependency (in contrast to peerDependency)
+            // updating to 1.8+ would fix it, but that causes a weird bug in the join tests,
+            // probably related to their default fieldResolver (it does some magic with aliases...)
+            schema: schema || defaultTestSchema as any,
         });
         this.server = await server.start({
             port,
             endpoint: '/graphql'
         });
-        console.log(`Test endpoint running on http://localhost:${port}/graphql`);
+        console.log(`Test endpoint running on http://localhost:${port}/`);
     }
 
     public stop() {
diff --git a/spec/helpers/server.ts b/spec/helpers/server.ts
index aaae88d..73ba800 100644
--- a/spec/helpers/server.ts
+++ b/spec/helpers/server.ts
@@ -40,7 +40,10 @@ export async function start() {
 
     const port = config.port || defaultPort;
     const server = new GraphQLServer({
-        schema,
+        // graphql-yoga declares @types/graphql as regular dependency (in contrast to peerDependency)
+        // updating to 1.8+ would fix it, but that causes a weird bug in the join tests,
+        // probably related to their default fieldResolver (it does some magic with aliases...)
+        schema: schema as any,
         context: () => ({}) // unique token
     });
     await server.start({
diff --git a/spec/regression/data/errors.config.ts b/spec/regression/data/errors.config.ts
index 062b290..e235bcd 100644
--- a/spec/regression/data/errors.config.ts
+++ b/spec/regression/data/errors.config.ts
@@ -1,5 +1,5 @@
 import { DocumentNode, graphql, GraphQLInt, GraphQLObjectType, GraphQLSchema, GraphQLString, print } from 'graphql';
-import { Response } from 'node-fetch';
+import { Response } from 'cross-fetch';
 import { WeavingConfig } from '../../../src/config/weaving-config';
 import { HttpGraphQLClient } from '../../../src/graphql-client/http-client';
 import { NonNegativeInt } from '../../helpers/non-negative-int';
diff --git a/src/graphql-client/http-client.ts b/src/graphql-client/http-client.ts
index a9ac258..958bb98 100644
--- a/src/graphql-client/http-client.ts
+++ b/src/graphql-client/http-client.ts
@@ -1,5 +1,5 @@
 import { DocumentNode, print } from 'graphql';
-import fetch, { Request, Response } from 'node-fetch';
+import fetch, { Request, Response } from 'cross-fetch';
 import { ClientExecutionResult } from './client-execution-result';
 import { mapErrorLocations } from './error-location-helper';
 import { GraphQLClient } from './graphql-client';
@@ -49,13 +49,13 @@ export class HttpGraphQLClient implements GraphQLClient {
         return await this.processResponse(json, document, variables, context, introspect);
     }
 
-    protected async fetchResponse(document: DocumentNode, variables?: { [name: string]: any }, context?: any, introspect?: boolean): Promise<Response> {
+    protected async fetchResponse(document: DocumentNode, variables?: { [name: string]: any }, context?: any, introspect?: boolean): Promise<any> {
         return this.fetch(await this.getRequest(document, variables, context, introspect));
     }
 
     protected fetch = fetch;
 
-    protected async getRequest(document: DocumentNode, variables?: { [name: string]: any }, context?: any, introspect?: boolean): Promise<Request> {
+    protected async getRequest(document: DocumentNode, variables?: { [name: string]: any }, context?: any, introspect?: boolean): Promise<any> {
         return new Request(this.url, {
             method: 'POST',
             headers: await this.getHeaders(document, variables, context, introspect),