Use `/usr/bin/env` instead of hard-coded python

It's much better to use `env`. My python might not be in `/usr/bin/python`. This is especially helpful when using `virtualenv`.
Use `/usr/bin/env` instead of hard-coded python 

It's much better to use `env`. My python might not be in `/usr/bin/python`. This is especially helpful when using `virtualenv`.
Merge pull request #1 from scoates/master

Use `env` for python path