[SSF] Members for tasks

Added an "Interested" field that would show up in the rheader/form for Tasks, and users can 'Watch' a task(i.e, assign themselves a 'following' role). However, deployment settings can be changed to allow Users to assign themselves other roles such as "Mentor", "Volunteer" that shows up as a dropdown-list along with the "Watch" button.

Ahm, don't see this as you doing something wrong. This is "peer review" for exactly that reason: you can miss these things easily. Happens to me and Fran just as often - which is why we review.
The goal is not that *you* become perfect - but the code ;)