title: subscribeToChannels not working
body: <p>I working on cab applicantion, in wich there is app for driver.
  I have to configure PubNub and subscribe to driver channel for particular driver.</p>
  
  <p>So what i did is : </p>
  
  <p>First configure client :</p>
  
  <pre><code>PNConfiguration *configuration = [PNConfiguration configurationWithPublishKey:kPublishKey subscribeKey:kSubscribeKey];
  self.client = [PubNub clientWithConfiguration:configuration];
  [self.client addListener:self];
  </code></pre>
  
  <p>Than after i subscribe to channel in that channel contain all driver so i send CAB_ID for that driver who logged in Like :</p>
  
  <pre><code>  NSDictionary *clientState = @{@"id": [[dicData valueForKey:@"data"] valueForKey:@"id"],
                                   @"rate": @"1.77",
                                   @"price": @"4",
                                   @"status" : @"Online",
                                   @"hold": @"0",
                                   @"ac_type": @"0",
                                   @"gender": [[dicData valueForKey:@"data"] valueForKey:@"gender"],
                                   @"bearing": @"213.68757972878151",
                                   @"lng": [NSString stringWithFormat:@"%f",longitude],
                                   @"lat": [NSString stringWithFormat:@"%f",latitude],
                                   @"driver_type": [[dicData valueForKey:@"data"] valueForKey:@"profile_type"],
                                   @"cab_type": @"hatchback",
                                   @"full_name": [[dicData valueForKey:@"data"] valueForKey:@"first_name"]
                                   };
  
      [self.client subscribeToChannels:@[kDriverMyChannel,@"CAB_250"] withPresence:YES clientState:clientState];
  </code></pre>
  
  <p>but it not effecting my panel, it not logging to driver channel.
  Please help.</p>