Merge pull request #12 from markhamstra/0.8.0-candidate-csd-6

Cherry-pick bug-fixes from AMPLab repo
[maven-release-plugin] prepare release spark-parent-0.8.0-candidate-csd-6.2
[maven-release-plugin] prepare for next development iteration
Make HadoopRDD's configuration accessible
Fix version numbers (increment the right part of the version)
Merge pull request #13 from mbautin/0.8.0-candidate-csd-6_hadooprdd_conf_and_fix_versions

Expose HadoopRDD's configuration and fix versions
[maven-release-plugin] prepare release spark-parent-0.8.0-candidate-csd-6.3
[maven-release-plugin] prepare for next development iteration
Restart DAGScheduler loop if it dies and log exceptions
Merge pull request #14 from mbautin/0.8.0-candidate-csd-6_dag_scheduler_try_catch

Restart DAGScheduler loop if it dies and log exceptions
log.error -> logError
Merge pull request #15 from mbautin/0.8.0-candidate-csd-6_dag_scheduler_try_catch

log.error -> logError