implement review comments
AT-27 introduce cake pattern for slick to remove dependency on specific driver
Merge branch 'feature/cake' of git://github.com/WegenenVerkeer/atomium into feature/cake

Conflicts:
	modules/server-jdbc/src/main/scala/be/wegenenverkeer/atom/JdbcFeedStore.scala
implement review comments
split JdbcFeedStore in two for different use cases:
* AutoJdbcFeedStore manages all tables automatically
* ManualJdbcFeedStore requires explicit management of feed entries tables