Update src/showcase/java/com/github/gwtbootstrap/showcase/client/Showcase.ui.xml

Fixed snapshot version
Enable mouse down event handler on IconAnchor (kinda `container` for some areas like TabLink) - mandatory in order to allow components (ie. TabLink) to be dragged and dropped.
Merge pull request #327 from porcelli/master

Enable mouse down event handler on IconAnchor
Allow clearing of NavList items in WellNavList
Merge pull request #330 from gonzohunter/clearnavlist

Allow clearing of NavList items in WellNavList
Added datetimepicker
Merge pull request #1 from gwtbootstrap/master

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Bug fixes & showcase entry
Make min/start/max view mode work correctly.  Fix initial viewmode.
Update author and version info
Remove commented out code
Merge pull request #334 from rexorient/master

datetimepicker
Merge branch 'master' of https://github.com/gwtbootstrap/gwt-bootstrap