- proof of concept for parallel testing
Merge branch 'master' into xdist_poc
- use a template database for PG so extensions get created automatically
Merge branch 'master' into xdist_poc

Conflicts:
	lib/sqlalchemy/engine/url.py
- scale up for mysql, sqlite
fix paren here
Merge branch 'master' into xdist_poc
- reorganize tox options