Add trackers name to the Sprints view, Add trackers to description in Tasks
view and Add read only permissions.

Thanks to:
    git diff 2cc01185ed43a595587843ea2267826d15fab755
    2bf7a3fc138d39edfd0de7f7619eba432c378fbc

From:
    git://github.com/ricemery/AgileDwarf.git