add rollback rake task
Merge pull request #77 from kylecrum/db-rollback

add rollback rake task
use camelize as to not singularize migrations ending in plurals
Merge pull request #76 from kylecrum/do-not-singularize-migrations

use camelize as to not singularize migrations ending in plurals
Updated CHANGELOG
Merge pull request #78 from darbyfrey/updated_changelog

Updated CHANGELOG