making this group students/mentors only

[Leigh Honeywell]

Hey everyone,

Now that GSoC is under way, we're going to use this list for
mentor/student communication only. As such, I'm going to remove
everyone except the accepted students and mentors.

To all the students we couldn't pick - thank you so much for your
applications. We were overjoyed at the great proposals we saw this
year. If you'd like to stay involved with k9 outside of the GSoC scope,
please feel free to subscribe to the main list over at
http://groups.google.com/group/k-9-mail - patches are welcome, and
there's lots to be done.

-Leigh, GSoC project admin.