Merge branch 'stable-3.3'

Merge branch 'stable-3.3'

* stable-3.3:
  Add new feature o.e.jgit.http.apache to p2 repository
  Fix NPE in RepositoriesViewContentProvider.getChildren for FOLDER
  Prepare post 3.3.0RC1 builds
  EGit v3.3.0.201402191814-rc1
  Prevent premature UI refreshes by batching resource changed events
  [historyView] Fix flickering of commit message scroll bars on mouse move
  Push Branch: Preselect merge/rebase if branch already configured
  Push Branch: Add checkbox for force push
  [historyView] Ref shortening with "..." can be longer than original
  Make "Clean..." available on project under Team > Advanced
  Disable cleaning if selection is empty
  In 'Search Git Repositories' wizard resolve variables in repository path

Change-Id: I6c287d479d222255bc4327f08e826e4ea12c2edb
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>