Keyboard plugin w/ shrinkView breaks when switching between different keyboards

If you have an <input type="date"> followed by an <input type="text"> or an <input type="time"> they all show different keyboards and fire UIKeyboardWillShowNotification without firing UIKeyboardWillHideNotification.

This causes the shrink code to happen multiple times.

The easiest fix is to add a check in shrinkViewKeyboardWillShow:
if (self.keyboardIsVisible)