A rake task to run migrations/snippets in Rails console

[ka8725]

The purpose of this task is to allow fixing DB schema things in Rails console or by a separate script that can be run by rails runner. This feature should make working with Rails more pleasing. This feature also fits the gem ideology to get rid of DB schema inconsistencies easily with minimum time spent.

Patch rails console to include rails migration commands or create another repl client. Improve things around rails runner - prepare a module? Update README accordingly