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
correction about netmount is extracted from a dropbox brunch
add a new command "url" (Get content URL)

If file.url == 1 requests from JavaScript client with XHR
Merge branch '2.x' into netmount

Conflicts:
	js/i18n/elfinder.jp.js
	php/elFinder.class.php
change netmount default session name to "elFinderNetVolumes"
fix doesn't work with jQuery 1.8.0
Merge branch '2.x' into netmount

Conflicts:
	js/i18n/elfinder.en.js
	js/i18n/elfinder.jp.js
	php/elFinder.class.php
[cmd:netmount] fix initialization of protocol
fix netunmout do not refresh sometime
[cmd:netunmout] support VolumeDriver::netunmount() method
[cmd:netmout] quickly screen redraw on netmount
add commandsOptions.netmout.*.done (function object)
add connector cmd `callback` for netmount authorizing etc...
Merge branch 'netmount' into pixlr_edit

Conflicts:
	css/toolbar.css
	js/elFinder.options.js
	js/i18n/elfinder.en.js
	js/i18n/elfinder.jp.js
	php/elFinder.class.php
[pixlr] use elfinder::callback
[i18n] tiny edit (white space)