first crack at inline images
reluctantly adding gifs
Correctly colour Jenkins failure notifications
Add AgileZen to list of system message senders

AgileZen is a kanban board web app.
Colour aborted jenkins jobs red
Improve matching of @mentions

- Don't match email addresses like 1234_567@chat.hipchat.com
- Match multiple mentions in one message
- Try it at http://refiddle.com/2o2