v5.2.0

Features:

• Added Rabarber.prune method to allow manual pruning of roles with deleted contexts

Misc:

• revoke_all_roles now returns an empty array instead of nil for consistency with other role assignment methods
• Deprecated the following role management methods in favor of new counterparts:
  • Rabarber::Role.names -> Rabarber.roles
  • Rabarber::Role.all_names -> Rabarber.all_roles
  • Rabarber::Role.add -> Rabarber.create_role
  • Rabarber::Role.rename -> Rabarber.rename_role
  • Rabarber::Role.remove -> Rabarber.delete_role
  • Rabarber::Role.assignees -> User.with_role