Fixed: _CPObjectAnimator initialize method did not match superclass return (#2743)

* Fixed: _CPObjectAnimator initialize method did not match superclass return

_CPObject animator labeled return type as BOOL, not only is this value not returned, but the super class CPProxy's initialize method returns void. Changed return type to void in _CPObject animator, to match superclass

AppKit/CoreAnimation/_CPObjectAnimator.j

@@ -20,7 +20,7 @@ var _supportsCSSAnimations = null;
     id <CPAnimatablePropertyContainer> _target;
 }
 
-+ (BOOL)initialize
++ (void)initialize
 {
     if ([self class] !== [_CPObjectAnimator class])
         return;