Add focusableInTouchMode to widget labels

See http://crbug.com/29344 for an explanation of why this is necessary.

Note that I have not actually tested this proposed change. On Chrome, it appears to be necessary to set it in Java rather than xml (TextView.setFocusableInTouchMode()), but I'm not sure why.
Merge pull request #37 from evanstade/patch-1

Add focusableInTouchMode to widget labels