add confirmation when trying to delete stage that has tasks and an error for when trying to create a stage that already exists
shows warning when trying to delete a task
shows warning when closing an edit task tab, still need to keep track of edits
checks if a task is edited and warns you when closing the edit task view, also warns you when viewing a requirement without selecting a requirement
updated the dialog boxes, stopped to warn user for creating tasks/view requirement since it should be a validation thing
merge dev-gradle into warnings
Made tests run faster
Fixed test
Update EditTaskView.java
Revert "Update EditTaskView.java"

This reverts commit 0bf55e143f49b515037376cd6eee6f969206a172.
Added javadoc
Merge remote-tracking branch 'origin/test-cleanup' into dev-gradle
Merge branch 'dragon-drop-fixes-tomerge' into dragon-drop-fixes
Merge branch 'dev-gradle' into dragon-drop-fixes
Fixed duplicate task bug. addTask now avoids creating duplicates in all cases.
Adding a null check. The way we're doing this is already a little shady - still doesn't work well with the same names.
fix for the duplicated stages
Merge branch 'fix-edit-task-with-new-task-open' into dev-gradle
Merge branch 'dev-gradle' of https://github.com/slash-slash-no-comment-WPI-cs3733/wpi-suite into warnings
deletes prototype dnd