fix CheckpointRDD getPreferredLocations java.io.FileNotFoundException
Merge pull request #620 from jerryshao/master

Fix CheckpointRDD java.io.FileNotFoundException when calling getPreferredLocations
Fixed memory leak in DAGScheduler- needs more tests under error conditions.
Removed copyright
CSD version numbering and distribution management
Bump some dependencies, pin others, for Scala 2.9.2
DAGSchedulerSuite now part of core/src/test/scala/spark/scheduler
wip: Bringing Jon's DAGScheduler tests into the new DAGSchedulerSuite
[maven-release-plugin] prepare release spark-parent-0.8.0-candidate-csd-1
[maven-release-plugin] prepare for next development iteration
Specified commons-io version for spark-core
[maven-release-plugin] prepare release spark-parent-0.8.0-candidate-csd-2
[maven-release-plugin] prepare for next development iteration