Fry .rvmrc

It's deprecated and ties us to old versions
Add note about Ruby 2 requirement
Allow custom module / class patterns for QA
Remove debug logging
Test authority class injection behavior
Replace valid_class? with proper method

No longer relies on exceptions in constantize, now uses similar logic
to instead just return true or false
Merge pull request #105 from OregonDigital/feature/allow-custom-module-in-qa

Feature/allow custom module in qa