Merge pull request #1 from VirginSoil/x-y-migration

.rvmrc => .ruby-version, add rows/columns to Plantings & fix #create for PlantingsController
fix plant finding on planting creation
remove rvmrc and change to .ruby-version
merge with master
Merge branch 'master' of github.com:VirginSoil/planting_season_API into x-y-migration