CCEditBox: work in progress to implement custom labels and input insets
CCEditBox: fixed position of label when edit box not being edited
CCEditBoxImplIOS: Removed hardcoded CC_EDIT_BOX_PADDING. Use InputInsets instead
Added iOS protocol Cocos2DNativeView for properly handling focus retain/release

Conflicts:
	cocos2dx/proj.ios/cocos2dx.xcodeproj/project.pbxproj
EAGLView: more generic handling of keyboard focus via first responder schem
CCEditBox: finalized addition of new features