Tag 'version' instead of 'target_milestone'
Fix nasty ES bug which blocked all commits after the first to be tagged.

In multiple commit POSTs, only the first commit was indentified and
tagged. Apparently this has something to do with how ES3 creates regular
expression objects.

See for more details
https://stackoverflow.com/questions/1760192/which-way-is-better-to-define-javascript-regular-expressions/1760506#1760506
Notify IRC with success / error.