Make the method to run a test method protected instead of private.
Move parallel testing ticker into the parallel role.
s/add/add_tags/g (we're going to rename this module)
Start making registry info more granular
Rename TagRegistry to AttributeRegistry
Test() and Tests() attributes now work.
Make :Test and :Tests attributes work.
Remove an unused variable.
Make sure that overriding a :Tests attribute works correctly.
Add docs for the new Test/Tests attribute behavior.
Adding test attributes to test control methods is now fatal.
Add release date to changes.