Added the tests for RequirementEvents {RequirementChangeset, NoteEvent}.

Signed-off-by: Mike Perrone <mjperrone@wpi.edu>,
Lauren Kahn <lmkahn@wpi.edu>,
and Tushar Narayan <tnarayan@wpi.edu>.
Merge remote-tracking branch 'origin/team1-requirementsModel' into team1-requirementsModel

Conflicts:
	RequirementsManager/src/edu/wpi/cs/wpisuitetng/modules/RequirementsManager/model/RequirementChangeset.java
	RequirementsManager/src/edu/wpi/cs/wpisuitetng/modules/RequirementsManager/model/RequirementEvent.java