feat: update to angular2@2.0.0-alpha.55

Author: IgorMinar

addon/ng2/blueprints/ng2/files/package.json

@@ -3,7 +3,7 @@
   "version": "0.0.0",
   "license": "Apache-2.0",
   "dependencies": {
-    "angular2": "2.0.0-alpha.54",
+    "angular2": "2.0.0-alpha.55",
     "es6-promise": "^3.0.2",
     "es6-shim": "^0.33.3",
     "reflect-metadata": "0.1.2",