ENH: Allow MySQL driver options to be specified in database.ini

For example to connect over SSL:

database.params.driver_options.1010 = "/path/to/client-key.pem"
database.params.driver_options.1011 = "/path/to/client-cert.pem"
database.params.driver_options.1012 = "/path/to/ca-cert.pem"
Merge pull request #8 from jamiesnape/MySQLDriverOptions

ENH: Allow MySQL driver options to be specified in database.ini