Revert "Remove async mostly from install.js"

This reverts commit f008e99.

src/install.js

@@ -114,25 +114,24 @@ package names to install with optional versions using the
               return void resolve({name: undefined, installPath: undefined});
           }
 
+          const commands = [];
           const children = fs.readdirSync(nodeModulesDirectory)
             .filter(dir => dir !== ".bin");
           assert.equal(children.length, 1, "Expected there to only be one child in node_modules");
           const child = children[0];
           const source = path.join(nodeModulesDirectory, child);
           const destination = path.join(this.atomPackagesDirectory, child);
+          commands.push(async () => await fs.cp(source, destination));
+          commands.push(async () => await this.buildModuleCache(pack.name));
+          commands.push(async () => await this.warmCompileCache(pack.name));
 
-          try {
-            await fs.cp(source, destination);
-            await this.buildModuleCache(pack.name);
-            await this.warmCompileCache(pack.name);
-
+          async.waterfall(commands).then(() => {
             if (!options.argv.json) { this.logSuccess(); }
-            resolve({ name: child, installPath: destination });
-
-          } catch(err) {
+            resolve({name: child, installPath: destination});
+          }, error => {
             this.logFailure();
-            reject(err);
-          }
+            reject(error);
+          });
         });
       });
     }
@@ -389,9 +388,11 @@ Run ppm -v after installing Git to see what version has been detected.\
 
     async installDependencies(options) {
       options.installGlobally = false;
+      const commands = [];
+      commands.push(async () => void await this.installModules(options));
+      commands.push(async () => void await this.installPackageDependencies(options));
 
-      await this.installModule(options);
-      await this.installPackageDependencies(options);
+      await async.waterfall(commands);
     }
 
     // Get all package dependency names and versions from the package.json file.