Documentation patch

Fixed some warnings I was getting about
* parameter 'startSelector' is already documented
* Parameter 'direction' not found in the function declaration
* /FTAnimationManager.m:67:1: Property is assumed atomic by default
* /FTUtils+UIGestureRecognizer.h:92:7: No newline at end of file

I forked from Strilanc/ftutils's patch which fixes: 
* /FTUtils+UIGestureRecognizer.m:52:1: Category is implementing a method which will also be implemented by its primary class