alphagov/transition — pull request #169 by rgarner (2014-01-31 10:28:56+00:00)
Title: Tag mappings

Only addresses single mapping tagging and adding tags while bulk adding as per the [story](https://www.pivotaltracker.com/story/show/64218782).

Bulk tagging of existing mappings is now [separated out](https://www.pivotaltracker.com/story/show/64841842).