* Build documentation on docs.openstack.org
* Add badges, update README
* Adjust docs subdirs to match the standards
Change-Id: Ie4f51f994ef783c4924a6523fbdfe600fede6d12
Moved public access to exceptions from metalsmith itself to
metalsmith.exceptions to avoid clutterning the former.
Updated tox.ini to use upper-constraints.
Change-Id: I136e036749171dc6d36d644e79c6fcfeef6242af