Added cheskstyle config file.
Fixed about a million checkstyle complaints.
Merge branch 'GLES2-AnchorCenter' of github.com:nicolasgramlich/AndEngine into GLES2-AnchorCenter
Added MethodNotFoundException.
Minor refactoring in SystemUtils.
Added WifiUtils (experimental).
Moved/Merged WiFiUtils, IPUtils and Bluetooth from AndEngineMultiplayerExtension to AndEngine.
Add CascadingAlphaModifier which will apply the alpha value for entity itself
and all its descendant children entities.
Call Entity.onAttached() and Entity.onDetached() when scene changing.
Add more description when font texture size is not enough.
Fixed case of WifiUtils.java.
Merge branch 'GLES2-AnchorCenter' of github.com:yhuiyang/AndEngine into GLES2-AnchorCenter