Added GEM to manage url shorting via bitly.

Usage:

  Bitly.client.shorten('http://www.google.com').short_url
Added url to routes

After every creation for a route, a short route would be saved to this route.
Merge pull request #23 from New-York-Falcons/short_url

Added GEM to manage url shorting via bitly.
Merge branch 'master' into link_route_course

Conflicts:
	app/models/route.rb
	app/views/routes/show.html.haml