Add to_bool to String class
Remove Roasters title from roaster#index
Run activation through Activation class

This is a more reusable class that will be independent of class. As
long as there is a pending field and a user object is passed it should
properly activate item.
Use #pending?

More explicit
Clean up roasts_controller

Utilize Activation class, get rid of cruft
Add #run_activation to Roast model
Add new factory with unset pending state
New roaster_controller specs