Bootstrap sass, dummy nav, added version to the ruby racer

Hi Ernie,

Bootstrap is installed. We'll have to check it out tomorrow when we've created routes. I added a dummy nav just to see if the responsive collapse is functioning. We can edit this moving forward.

I had to add a version to the ruby racer in the gemfile to get it to install on my machine. 

gem 'therubyracer', '~> 0.10.2'

This version worked for me but it's not the latest version (which wouldn't install). Hope this doesn't create conflicts tomorrow. 

Thanks.

Paris