First red test. Yea.
Add test for searching by first.
Add finding second using first.

Remove unused now trait.
Add test for searching using second.
Implementation for searching by second
Remove unnecessary code from junction table test.
Implementation of delete junction.
Add tests for deletion only for particular entry.
Implementation of deletions by one specify value.
Add test and implementation of exists.
Cleanup in tests
Move function to compiled queries.

Solve most of #9. Usage in test for this class.
Remove autotupling.
Fixes after review
Merge branch '9-junction-repository' into v0.6.x-slick-2.1.x
Version 0.6.0-M4
Version 0.6.0-M5

After save hook added.