rm bench modules from dev dependencies

package.json

@@ -12,7 +12,7 @@
     "complexity": "plato -r -t 'jenkins-client code report' -l .jshintrc -x 'node_modules|reports|test' -d reports/plato .",
     "complexity:open": "open reports/plato/index.html",
     "security": "nsp check",
-    "bench": "echo 'installing dependencies first ...' && sleep 1 && npm i benchmark microtime && echo '' && node bench"
+    "bench": "echo 'installing dependencies first ...' && sleep 1 && npm i --save-dev benchmark microtime && echo '' && node bench && npm uninstall --save-dev benchmark microtime"
   },
   "files": [
     "LICENSE",
@@ -41,11 +41,9 @@
     "base64-url": "^1.2.2"
   },
   "devDependencies": {
-    "benchmark": "^2.1.0",
     "istanbul": "^0.4.3",
     "jscs": "^2.11.0",
     "jshint": "^2.9.1",
-    "microtime": "^2.0.0",
     "plato": "^1.5.0",
     "pre-commit": "^1.1.2",
     "tap-spec": "^4.1.1",