Tidy up README

Author: hamchapman

README.md

@@ -22,11 +22,13 @@ What else would you want? Head over to the example app [ViewController.swift](ht
   * [Connection delegate](#connection-delegate)
   * [Reconnection](#reconnection)
 * [Subscribing to channels](#subscribing)
+  * [Public channels](#public-channels)
+  * [Private channels](#private-channels)
+  * [Presence channels](#presence-channels)
 * [Binding to events](#binding-to-events)
   * [Globally](#global-events)
   * [Per-channel](#per-channel-events)
   * [Receiving errors](#receiving-errors)
-* [Presence channel specifics](#presence-channel-specifics)
 * [Push notifications](#push-notifications)
   * [Pusher delegate](#pusher-delegate)
 * [Testing](#testing)
@@ -465,6 +467,8 @@ let myPrivateChannel = pusher.subscribe("private-my-channel")
 PusherChannel *myPrivateChannel = [pusher subscribeWithChannelName:@"private-my-channel"];
 ```
 
+Subscribing to private channels involves the client being authenticated. See the [Configuration](#configuration) section for the authenticated channel example for more information.
+
 ### Presence channels
 
 Presence channels are channels whose names are prefixed by `presence-`.
@@ -742,59 +746,6 @@ NSString *callbackId = [chan bindWithEventName:@"new-price" callback:^void (NSDi
 You can unbind from events at both the global and per channel level. For both objects you also have the option of calling `unbindAll`, which, as you can guess, will unbind all eventHandlers on the object.
 
 
-## Presence channel specifics
-
-Presence channels have some extra properties and functions available to them. In particular you can access the members who are subscribed to the channel by calling `members` on the channel object, as below.
-
-#### Swift
-```swift
-let chan = pusher.subscribe("presence-channel")
-
-print(chan.members)
-```
-
-#### Objective-C
-```objc
-PusherPresenceChannel *presChanExplicit = [pusher subscribeToPresenceChannelWithChannelName:@"presence-explicit"];
-
-NSArray *members = [presChanExplicit members];
-```
-
-You can also search for specific members in the channel by calling `findMember` and providing it with a user id string.
-
-#### Swift
-```swift
-let chan = pusher.subscribe("presence-channel")
-let member = chan.findMember(userId: "12345")
-
-print(member)
-```
-
-#### Objective-C
-```objc
-PusherPresenceChannel *presChanExplicit = [pusher subscribeToPresenceChannelWithChannelName:@"presence-explicit"];
-
-PusherPresenceChannelMember *me = [presChanExplicit findMemberWithUserId:@"12345"];
-```
-
-As a special case of `findMember` you can call `me` on the channel to get the member object of the subscribed client.
-
-#### Swift
-```swift
-let chan = pusher.subscribeToPresenceChannel(channelName: "presence-channel")
-let me = chan.me()
-
-print(me)
-```
-
-#### Objective-C
-```objc
-PusherPresenceChannel *presChanExplicit = [pusher subscribeToPresenceChannelWithChannelName:@"presence-explicit"];
-
-PusherPresenceChannelMember *me = [presChanExplicit me];
-```
-
-
 ## Push notifications
 
 Pusher also supports push notifications. Instances of your application can register for push notifications and subscribe to "interests". Your server can then publish to those interests, which will be delivered to your application as push notifications. See [our guide to setting up push notifications for iOS](https://pusher.com/docs/push_notifications/ios) for a friendly introduction.