feature/profile

Added a new profile option that can be used on the homepage. The profile area gives space for an avatar, the site title and a bio (the bio can be swapped for the tagline if desired).

Added a new layout named homepage that has the masthead replaced with this profile. Unsure on the proper name for this layout although I imagine it would most likely be used as one's homepage.

Added information in the README on how to make use of the profile. Simply change the layout in the Jekyll header and you are off.

Misc: I attempted to add a screenshot of the profile to the README but it did not come out as pretty as yours. Apologies!

<3

![image](https://cloud.githubusercontent.com/assets/1323467/2686045/3d9956b8-c1e1-11e3-838c-8e89a4575f56.png)