Just add this function to your functions.php. It will remove the version from all enqueued js and css files.

function remove_cssjs_ver( $src ) {
   if( strpos( $src, '?ver=' ) )
   $src = remove_query_arg( 'ver', $src );
   return $src;
}

add_filter( 'style_loader_src', 'remove_cssjs_ver', 999 );
add_filter( 'script_loader_src', 'remove_cssjs_ver', 999 );

If you add this to your functions.php it removes the WordPress version number from the RSS feed and the header.

function remove_wordpress_ver() {
     return '';
}
add_filter('the_generator', 'remove_wordpress_ver', 999);