FIX: greedy button group style according to appearance settings
FEATURE: get default icon on gservice invitation dialog when player has not own
FEATURE: google+ icon image loader on Gdx objects
REFACTORING: moved dice generator initialization ti GameScreen
FEATURE: getReturnGame dialog
FIX: missing new nativeAPI on desktop version
REFACTORING: moved returndialog from UIDialog to new EndGameLayer actor
FIX: chat usernames
REFACTORING: endGameLayer
FEATURE: added GSERVICE_PLAY_AGAIN message
FIX: regression
FEATURE: completed end game flow - need work on score/leaderboard recording
FEATURE: support for multiple message type pull
FEATURE: compatibility mode with older app version (no end game layer)
REFACTORING: complete handshaking before return game (rating reinitialization)
FEATURE: gservice trace match points
FEATURE: gservice_abandon(11) on opponent's network error
Merge branch 'gservice_return_game'
RELEASE: v2.7.0
FIX: set window flags on UI Thread