Merge pull request #155 from nilshartmann/master

Test diagnostics
~ removed some tests
~ removed some tests
~ cleaned up tests
removed 'testFailureIgnore'
~ Refactoring
~ API clean-up AbstractProjectContentProvider
~ added/modified mvn launcher
~ removed jedit-example for now (move to new repo)
~ renamed _incubator -> incubator
~ added target definition
~ introduced 'tycho' sub-directory
Merge remote-tracking branch 'origin/master'
Add to Stage Handler
Always immediately analyze staged artifacts
Don't set selections to Project Explorer (conflicts with new Stage View)
Allow user to set "Add mode" in Stage View
Removed "Pin Selection" and "Visualize children" (now configured via
Stage View)
In "add children" mode, add only children and not selected artifacts
itself)
Added "Clear Stage" Action
Allow removing of selected staged artifacts from stage