fix(app): removed async dependency

Author: DaftMonk

templates/common/_package.json

@@ -3,7 +3,6 @@
   "version": "0.0.0",
   "dependencies": {
     "express": "~3.4.3"<% if (mongo) { %>,
-    "async": "~0.2.9",
     "lodash": "~2.4.1",
     "mongoose": "~3.5.5"<% } %><% if (mongo && mongoPassportUser) { %>,
     "mongoose-unique-validator": "~0.3.0",