Started implementation of Scala participant for Java Renames
switching to eclipse 4.x
completing merge with master
First draft of Scala sources participating in Java Rename refactorings

Scala sources now participate in Java Rename refactorings. Renames of Java elements can now also be started on their occurrences in Scala code.
reactived scala participation in java search to pass tests
Some restructuring, considering RefactoringStatus after initialization now.
started to implement rename support on annotations
midterm commit
fixed MoveParticipant for package renames
some work on java part of scala rename,
repaired scala participant of java rename and triggering java rename in scala code
restructured java participants for scala rename, added test
some cleanup