add shebang for setup.py scripts
diff --git a/vectors/setup.py b/vectors/setup.py
index 53ec82e..bf02e38 100644
--- a/vectors/setup.py
+++ b/vectors/setup.py
@@ -1,3 +1,5 @@
+#!/usr/bin/env python
+
 # This file is dual licensed under the terms of the Apache License, Version
 # 2.0, and the BSD License. See the LICENSE file in the root of this repository
 # for complete details.