Add mocha to third_party

third_party/mocha/LICENSE

Index: third_party/mocha/LICENSE
diff --git a/third_party/expat/files/COPYING b/third_party/mocha/LICENSE
similarity index 63%
copy from third_party/expat/files/COPYING
copy to third_party/mocha/LICENSE
index dcb4506429684b253cc440ca40a109fb6b9253a9..ca47f261b3f92d9414ad2ae9b7cc2fb9afcf4f84 100644
--- a/third_party/expat/files/COPYING
+++ b/third_party/mocha/LICENSE
@@ -1,19 +1,19 @@
-Copyright (c) 1998, 1999, 2000 Thai Open Source Software Center Ltd
-                               and Clark Cooper
-Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006 Expat maintainers.
+(The MIT License)
+
+Copyright (c) 2011-2015 TJ Holowaychuk <tj@vision-media.ca>
 
 Permission is hereby granted, free of charge, to any person obtaining
 a copy of this software and associated documentation files (the
-"Software"), to deal in the Software without restriction, including
+'Software'), to deal in the Software without restriction, including
 without limitation the rights to use, copy, modify, merge, publish,
 distribute, sublicense, and/or sell copies of the Software, and to
 permit persons to whom the Software is furnished to do so, subject to
 the following conditions:
 
-The above copyright notice and this permission notice shall be included
-in all copies or substantial portions of the Software.
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
 
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY