Add fields for storing whether or not conference registration and early regisration are open.
Helper class which encapsulates the logic for setting registration open fields.
 - Written as a separate class for testability
Use the new helper class to set the registration open fields on both the getConference and getConferences endpoints
Adding a test for `RegistrationWindowCalculator` utility
Add some more test data for the system as it pertains to early registrations
Building out unit tests for `RegistrationWindowCalculator`
Fixing unfortunate variable name given to me by my IDE
Merge pull request #67 from CruGlobal/calc-registration-open

Calc registration open