Added version numbers to bower.json and package.json (#915)

### Description

Catapult (the internal tool we use to release Firebase JavaScript libraries) now works without the `0.0.0` version placeholder in the `bower.json` and `package.json` files. So, we can finally add the actual version numbers back into these files.

### Code sample

N/A

Author: Jacob Wenger

bower.json

@@ -1,7 +1,7 @@
 {
   "name": "angularfire",
   "description": "The officially supported AngularJS binding for Firebase",
-  "version": "0.0.0",
+  "version": "2.3.0",
   "authors": [
     "Firebase (https://firebase.google.com/)"
   ],

package.json

@@ -1,7 +1,7 @@
 {
   "name": "angularfire",
   "description": "The officially supported AngularJS binding for Firebase",
-  "version": "0.0.0",
+  "version": "2.3.0",
   "author": "Firebase (https://firebase.google.com/)",
   "homepage": "https://github.com/firebase/angularfire",
   "repository": {