Yelp interface to add customer information, navbar fix, remove customer authenication RSpec

This PR adds functionality which will allow vendors to import their vendor details from Yelp. Upon first sign in, it will as vendor if they want to import details. I suggest using 'Larkburger' account (user: "larkburger@example.com" pw: "mypassword1") after a fresh ``` db:drop db:migrate db:seed``` to see the full functionality.

Make sure you have OAuth install ```gem install oauth```

Also, I made the navbar collapsible, and cleaned it up a bit. It also has stubs for 'active' links. 

Lastly, I removed the customer specs from RSpec. They were BDD steps that we were (and should be) testing with Cucumber. Also, it's a total PITA breaking two suites when something on a view goes hairy!