Initial Google Games / Cloud Save implementation

Signed-off-by: Ian Lake <ian.hannibal.lake@gmail.com>
Adds missing new files

Signed-off-by: Ian Lake <ian.hannibal.lake@gmail.com>
Adds menu items for viewing Achievements and Leaderboards

Signed-off-by: Ian Lake <ian.hannibal.lake@gmail.com>
Adds achievement and leaderboard support

Signed-off-by: Ian Lake <ian.hannibal.lake@gmail.com>
Removes reset stats button

Signed-off-by: Ian Lake <ian.hannibal.lake@gmail.com>
Adds Javadoc to public/protected/default members and fields

Signed-off-by: Ian Lake <ian.hannibal.lake@gmail.com>
Removes error message when quitting from non-started game

Signed-off-by: Ian Lake <ian.hannibal.lake@gmail.com>
Converts to Gradle

Signed-off-by: Ian Lake <ian.hannibal.lake@gmail.com>
Updates build.gradle to match Manifest
Update to latest build tools version
Update to latest version of Google Play Services
Update Gradle distributionUrl to point to Gradle 1.8
Updates targetSdkVersion to allow building with latest Google Play Services. Ensures Up button retains ability to open About dialog.
Fix 100 win and 250 win achievement updating
Update to latest Google Play Services
Update to latest gradle and build tools
Update to latest BaseGameUtils
Do not force reload of achievements
Update to latest SDK and Google Play Services
Fixes Google Play Services integration issues