feature/profile

I 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).

 A new layout named homepage was added that is identical to default except for the removal of the masthead and the addition of the profile. I am unsure on the proper name for this layout, although I imagine it would most likely be used as one's homepage.

Put 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 added a screenshot of the profile to the README that was initially ugly but now is nice like the rest of the screenshots thanks to @hnrch02. 

<3

![Lanyon with Profile](https://cloud.githubusercontent.com/assets/1323467/2687323/cd66c9fe-c24c-11e3-84d4-62911c2404f1.png)