[SPARK-1981] Add AWS Kinesis streaming support

This is great example with a lot of functionality but for a newbie trying to learn Spark Streaming + Kinesis, this example looks a little scary because of its size. All we want to demonstrate in this example is how to use KinesisUtils, not that you can use window operations and stuff. There are other examples for that. So I would prefer this example being very short and to the point, like KafkaWordCount. Can you please change it to something like that?