Fixed problem with map becoming gray after using EditorActivity to add a task.
Fixes:
1. Map fragment updated so that screen no longer grays out when closing
EditorActivity or PickLocationActivity (stupid Android bug)
2. Streamlined and reorganized Marc's code in MyMapFragment after major
reorganization.
3. Streamlined Armando's code to use existing edit/add code in EditorActivity
instead of adding redundant logic. Also, old task now being properly
removed when an existing task is edited.
4. Hiding the Delete button on the ActionBar in EditorActivity when a new
task is being added.
Merging with Armando's checkin