fix(gen): move bluebird to dependencies

closes #1888

Author: Awk34

package.json

@@ -38,6 +38,7 @@
     "babel-plugin-syntax-class-properties": "^6.5.0",
     "babel-plugin-syntax-flow": "^6.5.0",
     "babel-plugin-transform-flow-strip-types": "^6.7.0",
+    "bluebird": "^3.3.5",
     "chalk": "^1.1.0",
     "generator-ng-component": "~0.3.0",
     "glob": "^7.0.3",
@@ -55,7 +56,6 @@
     "babel-plugin-transform-class-properties": "^6.6.0",
     "babel-preset-es2015": "^6.6.0",
     "babel-register": "^6.6.5",
-    "bluebird": "^3.3.5",
     "chai": "^3.2.0",
     "del": "^2.2.0",
     "grunt": "^1.0.1",