Java-SDK - 2.0.0 Beta 8

## 2.0.0-beta8

April 3rd, 2018

This build includes everything from 2.0.0-beta7. There are breaking changes to notification listeners.

### Breaking changes
* We have removed depercated classes with the NotificationBroadcaster in favor of the new API with the NotificationCenter. We have streamlined the API so that it is easily usable with Java Lambdas. We have also added some convenience methods to add these listeners. Finally, some of the API names have changed slightly (e.g. clearAllNotifications() is now clearAllNotificationListeners())