Updated NPM packages to match 'npm prune'

- package.json - Added the following packages to the devDependencies
  for drywall development. These include:

  * sequelize-fixtures - Used to create fixture files that will be
    used to seed the database initially

  * sinon - Spies, stubs and mocks for drywall app. Used in testing

  * supertest - HTTP Testing library for JavaScript apps

package.json

@@ -38,6 +38,8 @@
   },
   "devDependencies": {
     "bootstrap": "^3.x.x",
+    "chai": "^3.2.0",
+    "chai-as-promised": "^5.1.0",
     "font-awesome": "^4.1.0",
     "grunt": "^0.4.x",
     "grunt-cli": "^0.1.13",
@@ -54,7 +56,11 @@
     "html5shiv": "^3.x.x",
     "jquery": "^2.x.x",
     "jquery.cookie": "^1.x.x",
+    "mocha": "^2.3.0",
     "moment": "^2.x.x",
-    "respond.js": "^1.x.x"
+    "respond.js": "^1.x.x",
+    "sequelize-fixtures": "^0.4.7",
+    "sinon": "^1.16.1",
+    "supertest": "^1.1.0"
   }
 }