Merge pull request #13 from olibrook/master

Fetch the latest SDK version if 'url' is not specified. Documentation fixes.
Improved PEP8 and code style checking

Added pep8 and code style checks to the tox.ini
Checks are performed using flake8 with hacking (OpenStack)
addon installed
Updated TravisCI settings to use tox for testing
Fixed all PEP8 and hacking errors
Merge pull request #15 from prmtl/pep8

PEP8 and code style checking
fix typo in Download recipe
prepare to release 0.9.8
back to dev (0.9.9)