added bootstrap to javascript applicaiton and also added botsrtap to a custom sass file for css
added shared header which includes links to login in a text logo and links to log out if the user is logged in
added into the index method for airplanes, flights, pages and reservation controllers @users
added a render to shared header
added links to flights, reservations and airplanes index pages on the homepage
added spec and tests for the view page index page to test the 3 linsk were there
Merge pull request #11 from fedetaglia/em_dev

Bootstrap css and testing for the nav and index page