Added my name to the AUTHORS and CONTRIBUTORS files.

R=rsc
https://golang.org/cl/157153
diff --git a/CONTRIBUTORS b/CONTRIBUTORS
index 268e6c4..d17403d 100644
--- a/CONTRIBUTORS
+++ b/CONTRIBUTORS
@@ -28,6 +28,7 @@
 
 Abhinav Gupta <abhinav.g90@gmail.com>
 Adam Langley <agl@golang.org>
+Adrian O'Grady <elpollouk@gmail.com>
 Andrew Skiba <skibaa@gmail.com>
 Aron Nopanen <aron.nopanen@gmail.com>
 Austin Clements <aclements@csail.mit.edu>