Site Update

Sorry for having a "mega commit", but I don't think much here is questionable and I think we need some new stuff up on the site... nowish!

Included:

* Use the site title that was agreed upon in a previous PR. "Sass: CSS with Superpowers" I like it, ship it.
* Replaced the "Blog" link (2 years old!) and put in a link to the Twitter account that Chris has been keeping up
* Replaced the "/try.html" page... which was looking terrrrible and was almost unusable... with a link to "http://trysass.com" which is an independent open source project that I'm keeping up. No compass support yet, but neither does the "try.html" page. Much simpler, much more modern, and type as you update, etc. The new site will have an embedded version, but I think this is a good idea for now.
* Small update to the <meta> description to have a good explanation for our Google results.