Replace old Media Manager using elFinder

#What's New
Remove old media manager and replace with new media using elFinder..

#UPDATE GUIDE:
on backend config array, add these new config:

    /*
     * Disabled components
     */
    'disabled_components' => array(
        //'Media Manager'
    ),

    /*
     * Media rules
     */
    'upload_rules' => array(
        'uploadDeny' => array(),
        'uploadAllow' => array('all'),
        'uploadOrder' => array('deny','allow'),
    ),