SSP-2245 Update MyGPS task link handling for consistency

This commit updates the task.link rendering to be consistent with the client-side UI.
A task.link no longer needs html markup to display as a valid html link.

Conflicts:
	src/main/coffee/mygps/mygps/model/Task.coffee
	src/main/webapp/app/view/tools/actionplan/TasksGrid.js
SSP-2245 Invoke MyGPS Task link formatting code

Essentially a 2.5.x backport of the portion of
c89dbd9ae19ba005d3560047e9dacf79144d8993 in master (2.6.0) that
dealt with Task link formatting in Task.coffee.