Draft: Add differente sql driver and custom port

Problem/Motivation The module is configure to use only mysql database. The configuration of the port doesn't work for PGSQL.

Remaining tasks The bundle dapphp/securimage has an issue : we can't specify port for PGSQL, so I have made a pull request to fix that : https://github.com/dapphp/securimage/pull/102/files

As long as the feature is not merged, the correction of this module should not be merged.