Adding dragViewWithAccesibilityLabel:toViewWithAccesibilityLabel:

:warning: Not ready to be merged because of failing test case but __I am looking for pointers.__

I need the ability to drag one view to on top of another. Check here for a sample https://gist.github.com/seivan/6253882 (or check the test case commited) - in the sample I'm using Swipe, but I had to add 14 objects in order to fit into the short range of the swipe. 

Added: ```dragViewWithAccesibilityLabel:toPoint:``` and ```dragViewWithAccesibilityLabel:toViewWithAccesibilityLabel:```

I am considering adding ```dragViewWithPoint:toPoint:``` and   as well. But for now, lets focus on getting this to run. 

I could get my test case working using ```- (void)swipeViewWithAccessibilityLabel:(NSString *)label inDirection:(KIFSwipeDirection)direction``` 

But that only works if the direction is short enough for the swipe to work. However I can't get this to quite work, care to take a look at it? 


:warning: This branch only runs the new test case for now. :warning: