Revert "Remove schema_plus gem and convert migrations."

This reverts commit 992fe97537c14b5c5b86e285fc78084709740deb.
Revert "Convert `couple_round_tallies` to non-schema_plus"

This reverts commit 7f7c96a814e1db5401a64dd4e6628bff9ee379a0.
Update `schema_plus` Gem for rails 4.2
Merge branch 'schema-plus-4.2'

* schema-plus-4.2:
  Update `schema_plus` Gem for rails 4.2
  Revert "Convert `couple_round_tallies` to non-schema_plus"
  Revert "Remove schema_plus gem and convert migrations."