add gpgs notification callback.
Merge branch 'master' of https://github.com/Wu-Hao/TankMultiplayer

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Add show win or lose
remove main screen horse.
Merge pull request #24 from Ryeeeeee/master

add effects
merge with wuhao, and add GPGSChecker.
Merge branch 'master' of https://github.com/Wu-Hao/TankMultiplayer

Conflicts:
	Classes/AppDelegate.cpp
	Classes/GameScene.cpp
	Classes/MainScreenScene.cpp
	proj.ios_mac/TankMultiplayer.xcodeproj/project.pbxproj
Merge pull request #25 from fusijie/master

merge with wuhao. v0.5
trying to fix bounce bug and losing synchronization
fixed wagon and dude positions
add name in playback turn
update heros' actions and merge wuhao