WIP Add author information to card

Without this patch, while looking at the Trello board it's difficult to
see who opened a pull request.  This is a problem because I often need
to find a card that a particular user is talking about.

This patch addresses the problem by adding an avatar image of the
contributor, their full name, their company, and their email to the
description of the card.  In addition, their full name is included in
the card title.

As part of this change the job needs to communicate with Github to
obtain the full data about the github login who sent the pull request.

Here's what the card looks like:

![Trello Card](http://goo.gl/sNMa3)