Merge branch 'stable-4.0'

Merge branch 'stable-4.0'

* stable-4.0:
  Prepare 4.0.1-SNAPSHOT builds
  EGit v4.0.0.201506090130-r
  Fix GitRepositoriesViewHandlingTest.testAddRepoButton()
  Don't pre-select all repositories when opening RepositorySearchDialog
  Update documentation for 4.0
  Fixes potential NPE in CompareTreeView.
  Fix broken spell checking in commit message and Staging view
  Fix that double click is needed to "Check/Uncheck All Repositories"
  Ignore build result folders for gitflow bundles
  Fix tycho.scmUrl in pom.xml
  Update build to use Tycho 0.23
  Don't suggest branch name for push from remote tracking branch
  Fix SWTException "Widget is disposed" in BranchSelectionDialog
  Fix SWTException "Widget is disposed" in BlameOperation
  Fix NPE in CommitHelper.getHeadCommit
  Fix ClassCastException in GitModelSynchronizeParticipant
  Fix that double click is needed to "Check/Uncheck All Repositories"
  Silence unchecked conversion warnings in GitFlowAdapterFactory
  Fix NPE in GitFlowAdapterFactory

Change-Id: I369d800f1241d8bd40d2481b0f220fa8a0d6d88e
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>