- MySQL will also use the InnoDB engine now.
- Added a ping call in the MySQL Cursor cache mechanism
- Added a rollback call when a MySQLError occurs
- Removed 'delete_orphans' which is not needed anymore due to foreign key constraints and delete on cascade
- Changed SQLDatabase to accept options to create a cursor factory, instead of taking a pre-created cursor factory
- The SQLDatabase class now uses a context manager for mysql access.
- Most of the error handling is done by the context manager now
- Optimized several methods that returned a list into returning a generator
- Optimized return_matches to use an IN query instead.
- Other small fixes.
