Adds ticket purchase link to home page

Also included some top level navigation and removed the email list form
since it has been inactive throughout Feb.

![home-page](https://f.cloud.github.com/assets/77580/2305762/ca687574-a26a-11e3-943b-2580ca6778ab.png)

Registration screen at https://ti.to/burlington-ruby/2014-conference

![registration](https://f.cloud.github.com/assets/77580/2305764/d7e7e9fa-a26a-11e3-9cec-271df83d1925.png)