Revert "Merge branch 'migrations' into c4_s26_drag_and_drop_game"

This reverts commit a1527c5005716d2ad9aeea809f785f8e15f493fa, reversing
changes made to 0c13add4ecc15efd21ca8119c14d8f4b83b9087c.

Conflicts:
	kidzen/db/migrate/20140424085227_create_keywords.rb