Started extending touch support for MouseableEl

-Commented out the "ignore" block for "over" state
-Began checking for touch events and support
-Current bug: after tapping on an element for the first time (tested in iPad), the class "over" will "stick" until tapping again; afterwards it works correctly...
-In the near future will enable support for arrays (for multiple selectors including grabbing elements by class, tag name, etc.)