Remove reference to receiver
Code to instantiate a GoogleApiClient. Update play services version in build.gradle
Google Play Games sign-in
Login actually works
Fragment layout for before login placeholder
Fix first-time registration
Merge branch 'playgames'

Conflicts:
	app/src/main/java/edu/usc/csci201/tanks/network/TanksApi.java
Merge remote-tracking branch 'origin/master'