attempting to get tests to work with tabs
more attempting to get things to work
make workflow model a singleton
put default stages in workflow model
reload the workflow after editing tasks
Merge branch 'add-tabs-tests' into add-tabs

Conflicts:
	TaskManager/src/main/java/taskManager/controller/TabPaneController.java
	TaskManager/src/main/java/taskManager/controller/TaskController.java
	TaskManager/src/main/java/taskManager/view/EditTaskView.java
	TaskManager/src/main/java/taskManager/view/TabPaneView.java
tests pass! prettier editTaskView