Added Events, EventsTest utility class
Added Util utility class
Added Model, ModelTest utility class
Updated documentation of Model
Merge pull request #2 from jmfee-usgs/mvc_classes

Mvc classes
Added getId(),setId() methods to model
Added Observatory model object, unit test
Removing convenience getter/setters; will use generic get/set unless there is more logic.
Removed tests for convenience getters/setters
Merge pull request #3 from jmfee-usgs/observatory_model

Observatory model (EQH-2143)