Feature copy and polish

This is a significant style update. It adds feature copy to the homepage, as well as icons, a rouge highlighting theme, and a logo I've been working on. When you review, I'd boot it up to see it live which will obviously give you a far different look than just browsing the changes.

At this point, the things I think I have left to do are:
- [ ] Prepare for heroku (something always breaks so I have to figure out what that thing is)
- [ ] Sanitize the input that goes from the textarea to Rouge
- [ ] Wrap that all up in a parser class with error handling and the like

Anything else you can think of? I would also like to transfer / style the readme from Rouge to the website so people can get up and running without going to the github page, but I don't see that as strictly necessary.
Hm, is there a reason to use the git version?  I actually think having the site run the released version will help us with bug repros and stuff.