add support to accepts an array of route objects

[martinmicunda]

I like to define array of routes in my application same like in hapi so I have added option to pass array to route() function. route() accepts an object or array of objects now.

var router = require('koa-joi-router');
var public = router();

var routes = [
  {
    method: 'post',
    path: '/users',
    handler: function*(){}
  },
  {
    method: 'get',
    path: '/users',
    handler: function*(){}
  }
];

public.route(routes);

• [x] test
• [x] coverage
• [x] doc

[aheckmann]

Thanks!