New Icons: Pull in Octicons

[sudhirj]

Github just released the Octicons: https://github.com/blog/1135-the-making-of-octicons

It would be great to have them as a part of Font Awesome, especially for people building Github API based apps.

[kremalicious]

I think this is way outside of the scope of this project. Octicons resources aren't freely available so they can't be just pulled in, every icon needs to be redrawn for fontawesome and there're a lot of them: https://github.com/styleguide/css/7.0

Feel free to open requests for individual icons out of it, except for #154 of course :-)