AUTHORS: Add Gianluca Merlo as an author.

Signed-off-by: Gurucharan Shetty <gshetty@nicira.com>

AUTHORS

@@ -63,6 +63,7 @@ Francesco Fusco         ffusco@redhat.com
 FUJITA Tomonori         fujita.tomonori@lab.ntt.co.jp
 Gaetano Catalli         gaetano.catalli@gmail.com
 Geoffrey Wossum         gwossum@acm.org
+Gianluca Merlo          gianluca.merlo@gmail.com
 Giuseppe Lettieri       g.lettieri@iet.unipi.it
 Glen Gibb               grg@stanford.edu
 Guolin Yang             gyang@nicira.com