Update View+MASShorthandAdditions.h

Remove unnecessary import of UIKit, allowing OS X to compile successfully.

Masonry/View+MASShorthandAdditions.h

@@ -6,7 +6,6 @@
 //  Copyright (c) 2013 Jonas Budelmann. All rights reserved.
 //
 
-#import <UIKit/UIKit.h>
 #import "View+MASAdditions.h"
 
 #ifdef MAS_SHORTHAND
@@ -58,4 +57,4 @@ MAS_ATTR_FORWARD(baseline);
 
 @end
 
-#endif
+#endif