added spark-class and spark-executor to sbin

assembly/src/main/assembly/assembly.xml

bin/spark-daemon.sh

...e/spark/scheduler/mesos/CoarseMesosSchedulerBackend.scala

.../apache/spark/scheduler/mesos/MesosSchedulerBackend.scala

.../main/scala/org/apache/spark/ui/UIWorkloadGenerator.scala

core/src/test/scala/org/apache/spark/DriverSuite.scala

docs/running-on-yarn.md

docs/spark-standalone.md

make-distribution.sh

python/pyspark/java_gateway.py

sbin/spark-class

sbin/spark-class.cmd

sbin/spark-class2.cmd

sbin/spark-executor