Adding to AUTHORS and CONTRIBUTORS as per http://golang.org/doc/contribute.html#copyright

R=rsc
https://golang.org/cl/163050
diff --git a/AUTHORS b/AUTHORS
index e1c279b..f32f73c 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -11,6 +11,7 @@
 Abhinav Gupta <abhinav.g90@gmail.com>
 Adrian O'Grady <elpollouk@gmail.com>
 Andrew Skiba <skibaa@gmail.com>
+Anthony Starks <ajstarks@gmail.com>
 Aron Nopanen <aron.nopanen@gmail.com>
 Chris Lennert <calennert@gmail.com>
 Christopher Wedgwood <cw@f00f.org>