Product pages (/features) redesign

Working on an idea for the product pages - not looking to deploy for the time being as there's still some discussion about where this will live (ie, /features or /features/dashboard) and how certain minor aspects of the page might be affected by this decision, but it's ready for some code review and for people to have a peek!

![features---dashboard---mockup-1](https://cloud.githubusercontent.com/assets/883598/3173697/e9682b4a-ebe9-11e3-89c3-c807369ab1a4.jpg)