Add argparse to dependencies (python 2.6 compat)
Backport subprocess.check_output if needed (python 2.6 compat)
Update  CHANGES
Fix regression with python 2.7
Update tests to use utils.check_output rather than subprocess
Add python 2.6+ support in README
Fix #2 : Merge branch 'compat_python26' into develop

Infoqscraper is now compatible with python 2.6