src: Small source reorganization

Change-Id: I442f3ad0392ef4220e6435fc48e6d69acbd02076
diff --git a/AUTHORS.md b/AUTHORS.md
index 4b9e531..8c6db34 100644
--- a/AUTHORS.md
+++ b/AUTHORS.md
@@ -1,3 +1,4 @@
 Shuo Chen             <chenatu2006@gmail.com>
 Alexander Afanasyev   <http://lasr.cs.ucla.edu/afanasyev/index.html>
 Junxiao Shi           <http://www.cs.arizona.edu/people/shijunxiao/>
+Hang Zhang            <http://netlab.bit.edu.cn/z_hang>