Trello roadmap gets github status #96

Trello uses the link at the top of each card to get a status from github.  Uses same logic as getsatisfaction roadmap because I didn't want to rethink it or have them behave inconsistently.

Looks like it's working, but I need to redo card creation to know for sure.  Many cards up there predate the link at the top of the page thing.

Before doing that I'd like to wrangle the formatting.  Trello cards use markdown rather than html.  I can get github flavored MD no problem, but I'm not sure what to do about topics coming from getsatisfaction.