iothub-react 0.9.0

• While streaming events from Azure IoT Hub, expose runtime information, to allow monitoring how many events are left to stream (see MessageFromDevice.runtimeInfo).
• Change IoTHub public API to make it easier setting streaming options (see SourceOptions model) and to increase consistency across the board.
• Allow to stream from the position stored in the checkpointing storage, without enabling checkpointing.
• Support Cassandra authentication when using Cassandra to store offsets checkpoints (@knordstrom).
• Fix: when building pull-requests, disable tests requiring Travis CI secrets.
• Fix: rename created messages property to received.
• Allow injecting Configuration, e.g. to override settings stored in application.conf.
• Reduce cost of logging instrumentation.
• Added some syntactic sure for the list of partitions to stream and the list of offsets to start from.
• Use SBT modules and add scripts to make it easier running the included samples.
• Upgrade Scala from 2.12.0 to 2.12.1
• Upgrade internal dependencies, e.g. Akka and Azure SDKs.