## 示例和DEMO
- [x] 发送、接收消息
- [x] Sticky模式

![img1](https://user-images.githubusercontent.com/23290617/68295299-0f1bd780-00cd-11ea-8ad5-55a315fcdb59.gif)
![img2](https://user-images.githubusercontent.com/23290617/68295301-0fb46e00-00cd-11ea-8d27-a9cb4379ef5c.gif)

- [x] 任何时候都可以订阅消息
- [x] 一个简单的应用场景，发消息关闭所有Activity

![img3](https://user-images.githubusercontent.com/23290617/68295302-0fb46e00-00cd-11ea-922c-14b6d2d5b3b8.gif)
![img4](https://user-images.githubusercontent.com/23290617/68295303-104d0480-00cd-11ea-9f35-82caf853a779.gif)

- [x] 快速postValue也不会丢失消息
- [x] 整个生命周期（从onCreate到onDestroy）都可以实时收到消息

![img5](https://user-images.githubusercontent.com/23290617/68295305-104d0480-00cd-11ea-9ca0-a8b753da8b75.gif)
![img6](https://user-images.githubusercontent.com/23290617/68295307-104d0480-00cd-11ea-9737-a8e30ee82602.gif)