added devise User
added many-many relationship between users and routes
added associations between users and airports and airlines
added airports method to user
added date to route_users
added search by IATA/FAA code to airports#index
fixed bug where devise was missing from Gemfile
edited route line to make thicker and add more arrows
added Zurb Foundation Layout
deleted old app/assets/stylesheets/appliction.css file
added login/logout to navbar
updated styling on navigation bar and airport map
added feature specs for Current User Profile, Login, and Logout
updated login/logout navigation items