网络请求: AFNetworking : https://github.com/AFNetworking/AFNetworking
界面布局约束: Masonry : https://github.com/SnapKit/Masonry
加载网络图片: SDWebImage : https://github.com/rs/SDWebImage
提示: MBProgressHUD : https://github.com/jdg/MBProgressHUD
动画启动页: JazzHands :https://github.com/IFTTT/JazzHands
下拉刷新控件: MJRefresh : https://github.com/CoderMJLee/MJRefresh