Fix finding of assembly JAR, as well as some pointers to ./run

bin/compute-classpath.sh

core/src/main/scala/spark/deploy/worker/ExecutorRunner.scala

...a/spark/scheduler/mesos/CoarseMesosSchedulerBackend.scala

core/src/main/scala/spark/ui/UIWorkloadGenerator.scala

.../main/scala/spark/streaming/examples/ActorWordCount.scala

...c/main/scala/spark/streaming/examples/HdfsWordCount.scala

.../main/scala/spark/streaming/examples/KafkaWordCount.scala

...ain/scala/spark/streaming/examples/NetworkWordCount.scala

...a/spark/streaming/examples/StatefulNetworkWordCount.scala

...main/scala/spark/streaming/examples/ZeroMQWordCount.scala

...rk/streaming/examples/clickstream/PageViewGenerator.scala

...spark/streaming/examples/clickstream/PageViewStream.scala

sbt/sbt