Merge pull request #451 from ashtaroth/master

Navigation dropdown fix for mobile browsers
Revert "Merge pull request #451 from ashtaroth/master"

This reverts commit 5d46a5f91e7d6b34f9351de99510bb39367a99be, reversing
changes made to df2137852460553bde58b9d1be0d98f83115e757.
Revert "Merge pull request #449 from vetrovosk/dropdown-memleak"

This reverts commit 243b975367fe047afd282aaaf095899d268aae52, reversing
changes made to 85cbf3896814463005b000ab12c2fc9e7686c931.
NavCollapse has fixed height on first collapse

- NavCollapse now uses the "nav_collapse collapse" class instead of
"nav_collapse" to fix the issue with a fixed height when collapsing the
first time.
- Removed data_target from Boostrap as it's already in Constants.
Merge pull request #456 from acramatte/NavbarCollapseFixedHeight

NavCollapse has fixed height on first collapse
Merge pull request #1 from gwtbootstrap/master

Updating forked project