修复在 iOS8 及以下的系统中，关闭 ActionSheet 后旋转屏幕出现的崩溃 #32
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https://developer.apple.com/library/content/releasenotes/Foundation/RN-Foundation/index.html#10_11NotificationCenter
iOS9 以后当对象被释放掉后才会自动 removeObserver。 在 iOS8 及以下需要在 dealloc 时手动 remove。
如果不 remove，在 iOS8 及以下系统上 LCActionSheet 对象被释放掉以后仍旧会受到通知，会产生崩溃。