Fixes #100

SequenceIO and KafkaWordCount do not load related jars. Working on this.
This is true given our current way of packaging the jars in sbt. It was worse when we had all examples in one jar. If the build correctly packaged each task in its own jar then attaching this jar to a TaskDescription would make sense. So yes right now an 'application' jar is sent to each task which means we send more than we should in order to launch the task.  For wordcount ideally the task that runs 'Sum' would just load 'Sum'. So I think having TaskJar where it is makes sense if we packaged things up correctly. But currently Gear does not do this. I can put the jar information in AppDescription with this understanding.