Configurable config.path for authentication

Added an extra 'configPath' argument in connector.xml so that the config.php path can be configured.
The 'configPath' can be set as a parameter in aap/config/config.yml
This parameter would then be used in AbstractConnector.php, CKFINDER_CONNECTOR_CONFIG_FILE_PATH. If this parameter is entered in the config.yml of a site, then this config.php path would be selected instead of the default.
Why? This would allow us to adjust the function CheckAuthentication() whilst the bundle remain intact.