Version 0.15

Add changelog and acknowledgements for 0.13 release

Update docs for release

- bump to version 0.11

don't need explicit argparse import

- bump to version 0.9 for summit release

implement issue.update(), issue.delete()

- bump to version 0.7.0

- convert tools to package

- fix jirashell installation in setuptools
- bump to version 0.6

- fix path to repo