Adds full-width versions of the Haml logo

Started. Still needs the padded versions, and ideally, a fix for the left stem of the _m_, which might be a rounding error:

![screen shot 2014-12-08 at 2 56 40](https://cloud.githubusercontent.com/assets/1581276/5349043/74f5fd84-7eea-11e4-86e5-2653c05679d9.png)