Very lazy CommentManager that breaks things, but is good enough for testing
Add CommentValidator, tests.  Fix misc warnings.
Merge branch 'dev-exemplar' into dev-exemplar-comment-manager

Conflicts:
	DefectTracker/test/edu/wpi/cs/wpisuitetng/modules/defecttracker/MockData.java
	DefectTracker/test/edu/wpi/cs/wpisuitetng/modules/defecttracker/models/validators/MockData.java
	DefectTracker/test/edu/wpi/cs/wpisuitetng/modules/defecttracker/models/validators/MockDefectData.java
Add CommentManagerTest
Merge branch 'dev-exemplar-comment-manager' into dev-exemplar
Merge branch 'dev-exemplar' into dev-exemplar-defectview-observer-robustness