More work on deploy code (adding Worker class)

core/src/main/resources/spark/deploy/master/webui/index.html

core/src/main/resources/spark/deploy/worker/webui/index.html

core/src/main/scala/spark/Utils.scala

core/src/main/scala/spark/deploy/DeployMessage.scala

core/src/main/scala/spark/deploy/Worker.scala

core/src/main/scala/spark/deploy/master/Master.scala

.../src/main/scala/spark/deploy/master/MasterArguments.scala

core/src/main/scala/spark/deploy/master/MasterWebUI.scala

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

.../src/main/scala/spark/deploy/worker/WorkerArguments.scala

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

...src/main/scala/spark/scheduler/mesos/MesosScheduler.scala

core/src/main/scala/spark/util/MemoryParam.scala

core/src/test/scala/spark/MesosSchedulerSuite.scala

core/src/test/scala/spark/UtilsSuite.scala

run