added theme unit tests and started cleanup of remaining existing tests

Added authentication test and registration controller test. Added troubleshooting info to README. Added generic omniauth id to registration form

Added domain to the identifier_Scheme table. Added unit and functional tests for the identifier_scheme functionality

added identifier_Schemes table check to user.rb model. Both ActiveAdmin and Devise attempt to initialize the object during a rake command which forces a 'table does not exist' error.

Added tests for the new omniauth functionality