Created basic business deactivation feature

I created a cucumber feature for deactivation. It simply tests that
users can be businesses can be deactivated from the index page.
Added deactivate to businesses

I added a :deactivate method to the businesses controller and the
corresponding routes and specs. Users simply click ‘deactivate’ next to
any business to deactivate it.
Merge branch 'User-should-be-able-to-deactivate-businesses'