Toshi-hazard-store

Added
- query api improvements
- added meta table
- new query methods for meta and rlzs

Changed
- moved vs30 from curves to meta
- updated docs

Changed
- fixed mkdoc rendering of python & markdown.

Changed
- fix poetry lockfile

Added
- First release on PyPI.
- query and model modules providing basic support for openquake hazard stats curves only.