Added Devise

* Added Devise to gemfile
* Set default host in config
* Install Devise views
* Changed root route to welcome controller
* Created welcome controller
Require password to view site

* Created User model
* Added before filter to ApplicationController to check for autheticated user
* Created tests to check homepage requires login and can view page when logged in
Added Zurb Foundation

* Added foundation-rails gem to gemfile
* Ran rails g foundation:install
* Added top bar to layout
Only show logout link when user is logged in

* Created nav_user layout partial
* Changed layout to only include partial when user is logged in