Merge pull request #1 from gwtbootstrap/master

Updating forked project
Merge pull request #2 from gwtbootstrap/master

Revert "Merge pull request #456 from acramatte/NavbarCollapseFixedHeight...
Repeat of pull request #451 Navigation DropDown fix for mobile devices due to reverting some commits.

Comments once again:
This patch prevents deleting of onClick events in the drop-downs within navbar on mobile devices only.
Added LabelCell class

Support for rendering Bootstrap labels as a GWT Cell
Merge pull request #478 from dnorrell/master

Added LabelCell class
Merge pull request #458 from ashtaroth/master

Repeated pull request #451 Navigation DropDown fix for mobile devices.