added copyright file headers
codePro audit
added comments where missing
Merge branch 'dev-gradle' into persistentStageDragging

Conflicts:
	TaskManager/src/main/java/edu/wpi/cs/wpisuitetng/modules/taskmanager/draganddrop/DragStageController.java
	TaskManager/src/main/java/edu/wpi/cs/wpisuitetng/modules/taskmanager/model/StageModel.java
	TaskManager/src/test/java/edu/wpi/cs/wpisuitetng/modules/taskmanager/model/WorkflowModelTest.java