Initial setup ft. Sinatra, Backbone, & friends

* Thin
* Foreman
* Haml

* HTML5 boilerplate
* modernizr
* jQuery
* underscore

Based on https://github.com/addyosmani/backbone-fundamentals
Front end setup for user signups

* Haml form
* Backbone Model and View
Saves users in MongoDB
Thanks for signing up
Testing control flow
Replaces backbone for ye olde post form
An ODM brought to you by MongoMapper

+ Adds model abstraction for User
+ Timestamps
Adds email validations + flash notices