Splitting up core

• LarsTrieloff and DanielFagerstrom moved out the flowscript implementation to an own block, and where able to remove the Core's dependency on Rhino.

Create a Cocoon serializer for the current FOP release

• JeremiasMärki and LarsTrieloff created http://issues.apache.org/jira/browse/COCOON-1924 which adds FOP 0.92beta support to cocoon trunk.