plugin adjustments

1. sorting: I am using a custom sort criteria (role), but within each
role I wanted to ensure a "controlled" sorting, at best by display name
2. add CSS class for user role to member profile
3. add CSS class for user role to member div's in in members directory
4. add link to cover picture in the members directory for easier click.
5. cover picture in format 1.6:1.

um-config.php

@@ -1384,6 +1384,7 @@ $this->sections[] = array(
                 'desc' 	   		=> __( 'Choose global ratio for cover photos of profiles','ultimatemember' ),
                 'default'  		=> um_get_metadefault('profile_cover_ratio'),
 				'options' 		=> array(
+									'1.6:1' 			=> '1.6:1',
 									'2.7:1' 			=> '2.7:1',
 									'2.2:1' 			=> '2.2:1',
 									'3.2:1' 			=> '3.2:1',