Added link to Google Groups in a few docs (#741)

Author: Jacob Wenger

.github/CONTRIBUTING.md

@@ -19,8 +19,9 @@ which just ask about usage will be closed. Here are some resources to get help:
 - Read the full [API reference](https://angularfire.firebaseapp.com/api.html)
 - Try out some [examples](../README.md#examples)
 
-If the official documentation doesn't help, try asking a question through our
-[official support channels](https://firebase.google.com/support/).
+If the official documentation doesn't help, try asking a question on the
+[AngularFire Google Group](https://groups.google.com/forum/#!forum/firebase-angular) or one of our
+other [official support channels](https://firebase.google.com/support/).
 
 **Please avoid double posting across multiple channels!**
 
@@ -109,9 +110,9 @@ $ grunt            # lint, build, and test
 
 $ grunt build      # lint and build
 
-$ gulp test        # run unit and e2e tests
-$ gulp test:unit   # run unit tests
-$ gulp test:e2e    # run e2e tests (via Protractor)
+$ grunt test       # run unit and e2e tests
+$ grunt test:unit  # run unit tests
+$ grunt test:e2e   # run e2e tests (via Protractor)
 
 $ grunt watch      # lint, build, and test whenever source files change
 ```

.github/ISSUE_TEMPLATE.md

@@ -14,7 +14,8 @@ will be closed. Here are some resources to get help:
 
 If the official documentation doesn't help, try asking through our official support channels:
 
-https://firebase.google.com/support/
+- AngularFire Google Group: https://groups.google.com/forum/#!forum/firebase-angular
+- Other support channels: https://firebase.google.com/support/
 
 *Please avoid double posting across multiple channels!*