Merge pull request #195 from dennybritz/feature/fileserver

core/src/main/scala/spark/HttpFileServer.scala

core/src/main/scala/spark/SparkContext.scala

core/src/main/scala/spark/SparkEnv.scala

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

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

core/src/main/scala/spark/executor/Executor.scala

core/src/main/scala/spark/scheduler/ShuffleMapTask.scala

core/src/main/scala/spark/scheduler/Task.scala

...main/scala/spark/scheduler/cluster/ClusterScheduler.scala

...src/main/scala/spark/scheduler/local/LocalScheduler.scala

core/src/test/resources/uncommons-maths-1.2.2.jar

core/src/test/scala/spark/FileServerSuite.scala