Adding my name to authors/contributors. I'm waiting to hear

Adding my name to authors/contributors.  I'm waiting to hear
back from Carnegie Mellon about whether they're interested in
signing the agreement (do you know if they have already?).
In the meantime, I'm submitting these changes on my own time.
If CMU has already signed the corporate contributor agreement,
please remove my name from the AUTHORS list.

R=rsc
https://golang.org/cl/154161