Return ActiveRecord::Relations for `recommended_*` methods
Return ActiveRecord::Relations for `recommended_*` methods

A supposedly database-compatible way to do this; possibly addresses #96
and #103, but I'd like user feedback first.

Signed-off-by: David Celis <b1c1d8736f20db3fb6c1c66bb1455ed43909f0d8@davidcel.is>

mikesmayer/recommendable,davidcelis/recommendable,AndyObtiva/recommendable,balmbees/recommendable