Cleanups in Foundation. (#289)
ObjCMemberPlugin will now add @NotImplemented to all overridable methods to make sure that CocoaTouch doesn't believe an optional method has been implemented unless the custom class overrides the method. This also prevents routing
of calls through the Java side unless the method has actually been overridden. Also changed ObjCClass to ignore static and private methods when searching for @NotImplemented methods. (#276)