fix multi net-volume & for override inherited class

ex. I use next class

require_once _MD_ELFINDER_LIB_PATH . '/php/elFinderVolumeFTP.class.php';

elFinder::$netDrivers['ftp'] = 'FTPx';

class elFinderVolumeFTPx extends elFinderVolumeFTP {
	protected function configure() {
		$this->tmbPath = XOOPS_ROOT_PATH .
'/modules/'._MD_ELFINDER_MYDIRNAME.'/cache';
		
		parent::configure();

		$this->disabled[] = 'pixlr';
	}
}
make "net mount key" on each volume driver
Volume driver for Dropbox.com
brush up
fix move return target path
fix resize function
file_put_contents with LOCK_EX
Default alias name to "Dropbox.com"
support net mount
support netMountKey
brush up
update connector
fix for POST method
API's result "rev" uses for thumbnail
fix protocol label
add comment
fix problem callback url & brush up
proposal from Dropbox.com

> As you are using the OAuth flow for your app's authorization, you
should not have fields for username and password, as it may confuse your
users. (And you don't need to show the access token to the user.)
mata data cache
fix matadata cache ttl