update sortable plugin to work with latest version of select2
update sortable plugin to work with latest version of select2

GawainLynch/bolt,romulo1984/bolt,bolt/bolt,romulo1984/bolt,romulo1984/bolt,bolt/bolt,GawainLynch/bolt,nikgo/bolt,bolt/bolt,nikgo/bolt,GawainLynch/bolt,nikgo/bolt,nikgo/bolt,bolt/bolt,GawainLynch/bolt,romulo1984/bolt