Add currentSystemTimeMs and currentStreamTimeMs to ProcessorContext <https://cwiki.apache.org/confluence/display/KAFKA/KIP-622%3A+Add+currentSystemTimeMs+and+currentStreamTimeMs+to+ProcessorContext>
I am extremely new to Kafka, but thank you to John Roesler and Matthias J. Sax for pointing me in the right direction. I accept any and all feedback. Thanks, Will
