added firebase - used to be a transitive dependency

Author: jhades

package.json

@@ -20,12 +20,13 @@
     "@angular/forms": "2.0.1",
     "@angular/http": "2.0.1",
     "@angular/platform-browser": "2.0.1",
-    "@angular/platform-browser-dynamic": "2.0.1", 
+    "@angular/platform-browser-dynamic": "2.0.1",
     "@angular/router": "3.0.0",
     "@types/lodash": "^4.14.36",
     "@types/request": "0.0.30",
     "angularfire2": "^2.0.0-beta.4",
     "core-js": "^2.4.0",
+    "firebase": "^3.6.6",
     "firebase-queue": "^1.5.0",
     "lodash": "^4.15.0",
     "rxjs": "5.0.0-beta.12",