Support rich responses and client configuration options from discovery servers

[h2non]

[
  { 
     url: 'http://1.server.com', 
     timeout: 3000, 
     priority: 1,
     concurrency: 20,
     allowMethods: ['GET'],
     weight: {
        latency: 50,
        response: 35,
        error: 15
     }
   }
]

[h2non]

@germanramos Which are your opinions about supporting a more rich response from discovery servers like Hydra to dynamically configure the client??