[OLINGO-328] pom maintenance
[OLINGO-328] refactor EntitySetProcessor to CollectionProcessor
[OLINGO-328] API design and setup of TDD
[OLINGO-328] improve multi valued headers of ODataRequest
[OLINGO-328] improve AcceptType for multi value support
[OLINGO-328] refactor content negotiation
[OLINGO-328] Merge remote-tracking branch 'origin/master' into olingo328
[OLINGO-328] all cases implemented
[OLINGO-328] refactor
[OLINGO-328] Merge remote-tracking branch 'origin/master' into olingo328
[OLINGO-328] code cleanup and checkstyle issues