- flushed out PriorityService to use PriorityOverride
-improved PriorityOverride DSL class to return priorities instead of numbers and no longer use closures for the metaclass implementation
- completed PriorityOverride methods for 3 types of DSL definitions: postalCode, Sibling, and Student
- added School to the domain classes
- created some bootstrap data for intergration testing
- started a very basic integration test