github代码收集推荐

https://github.com/AFNetworking/AFNetworking
https://github.com/jessesquires/JSQMessagesViewController
https://github.com/jessesquires/JSQSystemSoundPlayer
https://github.com/relatedcode/ProgressHUD
https://github.com/relatedcode/RealtimeChat
https://github.com/relatedcode/NotificationChat