Refactor to move most of Hydra::AccessControls::Permissions into Hydra::Datastream::RightsMetadata and DRY up access exceptions
Refactor access/visibility adding limited visibility to Hydra override
Get rid of limited access level; move user/group exceptions to read_users/read_groups
Fixed regular login directs to self_closing.html
Switch from imputed (virtual_groups) login logic to explicit (full_login?) logic
Move hidden and virtual group tests to concern specs
Switch to visibility from access
Merge pull request #229 from avalonmediasystem/feature/recognize-full-login

Switch from imputed (virtual_groups) login logic to explicit (full_login?) logic
Merge pull request #227 from avalonmediasystem/feature/lti-cleanup

Switch to visibility and dump limited level
Merge pull request #226 from avalonmediasystem/bugfix/self_closing

Fixed regular login redirecting to self_closing.html