/**
* Sets the configuration mode
*
* A mode is set in the config files for each entry in case of multiple
* entries of the same type that may be used in different environment
* such as live, dev, debug mode.
* This mode, which is optional but if given it will be used by the config
* process to determine which entry to retrieve.
*
* @param string $mode mode
*
* @return null
*/
public static function setMode($mode)
{
self::$mode = $mode;
}
