适配

http://blog.csdn.net/think_ma/article/details/40652719
http://www.cocoachina.com/ios/20141026/10045.html
iPhone4S,iPhone5/5s,iPhone6
竖屏：(w:Compact h:Regular)
横屏：(w:Compact h:Compact)
iPhone6 Plus
竖屏：(w:Compact h:Regular)
横屏：(w:Regular h:Compact)
iPad
竖屏：(w:Regular h:Regular)
横屏：(w:Regular h:Regular)
Apple Watch(猜测)
竖屏：(w:Compact h:Compact)
横屏：(w:Compact h:Compact)