Simplify app.all and app.VERB

https://github.com/strongloop/express/blob/5.0/lib/application.js

Currently:

/**
 * Delegate `.VERB(...)` calls to `router.VERB(...)`.
 */

methods.forEach(function(method){
  app[method] = function(path){
    if ('get' == method && 1 == arguments.length) return this.set(path);

    var route = this.route(path);
    route[method].apply(route, slice.call(arguments, 1));
    return this;
  };
});

/**
 * Special-cased "all" method, applying the given route `path`,
 * middleware, and callback to _every_ HTTP method.
 *
 * @param {String} path
 * @param {Function} ...
 * @return {app} for chaining
 * @api public
 */

app.all = function(path){
  var route = this.route(path);
  var args = slice.call(arguments, 1);
  methods.forEach(function(method){
    route[method].apply(route, args);
  });

  return this;
};

But the following simplified code does exactly the same (in fact lib/Router/index.js does it):

/**
 * Delegate `.all(...)` and `.VERB(...)` calls to `Router#all(...)` and `Router#VERB(...)`.
 */

methods.concat('all').forEach(function(method){
  app[method] = function(path){
    if ('get' == method && 1 == arguments.length) return this.set(path);

    var route = this.route(path);
    route[method].apply(route, slice.call(arguments, 1));
    return this;
  };
});