GH #86 - Preliminary support for MySQL.
GH #86 - Fixing up patches.
GH #86 - Set pool_recycle to 600s (must be lower than wait_timeout on MySQL end).
GH #86 - Don't assume that not MySQL is always Postgres.
GH #86 - Let users specify mysql instead of mysql+pymysql.
Merge branch 'dsuch-f-gh86-mysql-support'