restore JDBCModelExtractor (as requested by Morris)
Merge branch 'master' of https://github.com/molgenis/molgenis
Merge pull request #311 from mdijkstra/master

Implemented -defaults, error handling, ...
Merge pull request #309 from dennishendriksen/master

Restore JDBCModelExtractor
Decide based on cmnd-line args what to do (eg generate? start/end db?)
Merge branch 'master' of github.com:molgenis/molgenis