SLING-2788 - move bridge module from whiteboard to extensions

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1611616 13f79535-47bb-0310-9956-ffa450edef68
SLING-3771 - JUnit bridge module added

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1611622 13f79535-47bb-0310-9956-ffa450edef68