Use /usr/bin/env python

Summary: Use python from env, instead of the distro installed one in /usr/bin

Test Plan:
Ran arc anoid on a system that only had python in /usr/bin, still
works. Ran arc anoid on a system that had a python in /usr/local/bin before
/usr/bin.  Still works as well

Reviewers: epriestley, alanh

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D3451

scripts/breakout.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python
 import sys
 import time
 import select