Merge pull request #3 from unixorn/master

Add isExecutable helper
Start making this ready for PyPI
Bump version to 0.5 since we're publishing to PyPI
Fix missing : in docstring
Update install instructions now that we're on PyPI and pip install works
Clean up shellshock test strings
Add README.rst

* Add Makefile to make generating README.rst from README.md easier
* Update setup.py to use README.rst
* Bump version
Add upload target to Makefile
Merge pull request #5 from unixorn/prep-for-pypi

Prep for pypi