[OLINGO-266] move provider and test to ref module
[OLINGO-266] initial reference scenario servlet
[OLINGO-266] refactor ref module to server-ref
[OLINGO-266] ref package refactoring
[OLINGO-266] first draft of ref handler
[OLINGO-266] log&trace
[OLINGO-266] Merge remote-tracking branch 'origin/master' into olingo-266-ref
[OLINGO-266] initial cargo ref integration test
[OLINGO-266] Merge remote-tracking branch 'origin/olingo-266-ref'