Update Release

I have backported a few fixes from the up and coming v0.1.15 release of TaskMaster. These fixes include the following:
(1) User Administration for the TaskMaster database is complete.

(2) When the user clicks the (X) on the Main Screen, it returns to the System Tray, rather than exiting the program.

(3) Made some changes to some of the code, to fix a bug where Users were duplicated in the user list for the group.