Implement swipe to delete in UITableViewCell's fix

Swipe to delete for UITableViewCell's is broken.  This issue is easy to replicate by creating a UIView with a UITableView.  Then add the gesture recognizer to the view.

    SWRevealViewController *revealController = [self revealViewController];

    [self.view addGestureRecognizer:revealController.panGestureRecognizer];
 
Swipe to delete for UITableViewCell's is then broken.

This pull request also fixes this reported issue:
https://github.com/John-Lluch/SWRevealViewController/issues/104

More discussion here:
http://stackoverflow.com/questions/18369844/get-swipe-to-delete-on-uitableview-to-work-with-uipangesturerecognizer