Hide share section if logged in from LTI
Rename spec/controllers/omniauth_callbacks_controller.rb to omniauth_callbacks_controller_spec.rb
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
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
Use mbklein's full_login method to determine shareability
Merge pull request #228 from avalonmediasystem/feature/VOV-2320

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