Issue with input field in swiper

Even if "releaseFormElements" is set to true the the input field has to be tapped twice to give focus.  This is because the first tap is being registered as a "mousedown" event and not a "touchstart" event (Tested on iOS 6/7 & chrome with touch events enabled).  I put in a check where you are checking for a touch event to see if we are releasing form elements and if the element is an input field.  I have not checked to see if other form elements have this same issue, for my purposes I had to make this change.  If you see a better way of implementing this check, feel free to make the change.
Merge pull request #279 from mattdemps/patch-1

Issue with input field in swiper