* Switch to SQLAlchemy for the Recorder component. Gives the ability to use MySQL or other.
* fixes for failed lint
* add conversion script
* code review fixes and refactor to use to_native() model methods and execute() helper
* move script to homeassistant.scripts module
* style fixes my tox lint/flake8 missed
* move exclusion up
Two tests were invariably grinding my system to a halt as it was
applying migrations to an empty sqlite database. This patch reduces
the time of a pytest run from 50 to about 16 seconds on my desktop.
The difference is even more noticable on a slower laptop drive, but
is probably insignificant for all you fancy SSD users.
