Prepare release 2.7

Change-Id: Ifd407be51576e78af378cafe92fa2bfa904906ae
diff --git a/AUTHORS b/AUTHORS
index 166e8d8..9a11633 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -19,3 +19,4 @@
   * Yuanzhi Gao                 <billmaxwell@ucla.edu>
   * Mohammad Sabet              <mhasabet@gmail.com>
   * Xinyu Ma                    <bitmxy@gmail.com>
+  * Chavoosh Ghasemi            <chghasemi@cs.arizona.edu>