Remove assumption of Python path.

For example, on a FreeBSD system Python can be installed in
/usr/local/bin/python.

Some systems have multiple interpreters installed in a variety of
locations.  The attached patch corrects the problem by using the
env(1) command to run Python.

Signed-off-by: Adam Waldenberg <adam.waldenberg@ejwa.se>

gitinspector/gitinspector.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python
 # coding: utf-8
 #
 # Copyright © 2012-2014 Ejwa Software. All rights reserved.