Nobrainer, ORM for RethinkDB, support
Changes recommended by @nviennot

More exact ORM checking for NoBrainer and requiring
active_support/core_ext for the facet tests.
Set a min required gem version for NoBrainer

The SQL test will fail with a lesser version as v0.19.0 adds the
ability to set the created_at and updated_at times
Only install RethinkDB when needed
Merge branch 'eksoverzero-nobrainer'