Added minitest helpers
Refactored so you won't need to always create a base policy
Removing the install generator since you don't need a base policy all the time now
Added a fetch_roles generator to make it painless when you need to tell canner how to get your users roles
Modified the policy generator to work with the Policy refactor.  Added ability to specify the parent class also.
Fixed a broken spec
Fixed up the readme to account for the recent refactoring and wiki additions
Default fetch_roles so nothing needs done in that situation.
Throw a more helpful error message if the user might need to override fetch_roles
Bumped version