code: function join_plugins(plugins) {
  	debug.assert(plugins).is('array');
  	debug.assert( ARRAY(plugins).every(is.func) ).equals(true);
  
  	return function join_plugins_(req, res, next) {
  		var queue = [].concat(plugins);
  
  		function do_iteration_() {
  			if(queue.length === 0) {
  				next();
  				return;
  			}
  			var plugin = queue.shift();
  			debug.assert(plugin).is('function');
  			plugin(req, res, function plugin_wrapper(err) {
  				if(err) {
  					next(err);
  					return;
  				}
  				do_iteration_();
  			});
  		}
  
  		function do_iteration() {
  			try {
  				do_iteration_();
  			} catch(err) {
  				next(err);
  				return;
  			}
  		}
  
  		do_iteration();
  	};
  }
docs: Join multiple Express plugins into one