Monkey-patches (to our own classes, no less)

* To avoid deprecation warnings or other nonsense caused by gem clashes
No-JS bulk tagging of existing mappings

* We subvert the purpose of params[:http_status], allowing 'tag'
* We use a BulkTagger class with the same interface as BulkEditor
BulkTagger existing mapping behaviour should:

* Remove common tags removed from tags field
* Add or ensure presence of other tags
* Leave non-common tags alone