Initial work for Slick 2.0.0

Manual local build of play-slick 0.6.0-SNAPSHOT is required.

Project does not compile yet - WIP.

Fixes #4
Working version on Slick 2.0, still neds some work
Version bumped to 0.5-SNAPSHOT

Changes after rebase to master
Fix compilation query problem.
BaseRepository added

A repository for entities without Id, such as join tables etc.
Issue #8 port to Slick 2.0
Merge branch '4-slick-2.0-integration'

Version bumped to 0.5.0-RC1