Merge pull request #327 from rxin/spark-633

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

core/src/main/scala/spark/storage/BlockManager.scala

core/src/main/scala/spark/storage/BlockManagerId.scala

core/src/main/scala/spark/storage/BlockManagerMaster.scala

...rc/main/scala/spark/storage/BlockManagerMasterActor.scala

core/src/main/scala/spark/storage/BlockManagerMessages.scala

...src/main/scala/spark/storage/BlockManagerSlaveActor.scala

core/src/main/scala/spark/storage/BlockStore.scala

core/src/main/scala/spark/storage/DiskStore.scala

core/src/main/scala/spark/storage/MemoryStore.scala

core/src/main/scala/spark/storage/StorageLevel.scala

core/src/main/scala/spark/storage/ThreadingTest.scala

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

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

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

core/src/test/scala/spark/storage/BlockManagerSuite.scala

project/SparkBuild.scala