Move typealiases to PusherConnection, where they are referenced

Author: hamchapman

Source/PusherConnection.swift

@@ -6,6 +6,9 @@
 //
 //
 
+public typealias PusherEventJSON = [String : AnyObject]
+public typealias PusherUserData = PresenceChannelMember
+
 public class PusherConnection {
     public let url: String
     public let key: String

Source/PusherSwift.swift

@@ -7,9 +7,6 @@
 
 import Foundation
 
-public typealias PusherEventJSON = [String : AnyObject]
-public typealias PusherUserData = PresenceChannelMember
-
 let PROTOCOL = 7
 let VERSION = "1.0.0"
 let CLIENT_NAME = "pusher-websocket-swift"