Adds barebones SEO

Still to do:
- [x] Google Analytics
- [ ] XML sitemaps
- [ ] Page caching

I was using this article as a light reference: http://www.inboundio.com/blog/seo-for-ruby-on-rails-complete-guide/
I've reversed the order of the page title and the base title, following Quora's lead:

> Project Credo - Are there long term health benefits for consistent meditation (mindfulness practice)?

Becomes:

> Are there long term health benefits for consistent meditation (mindfulness practice)? - Project Credo