Call executeOnCompleteCallbacks in more finally blocks.
Merge pull request #416 from stephenh/morefinally

Call executeOnCompleteCallbacks in more finally blocks.
Fix JavaRDDLike.flatMap(PairFlatMapFunction) (SPARK-668).

This workaround is easier than rewriting JavaRDDLike in Java.
Merge pull request #417 from JoshRosen/spark-668

Fix JavaRDDLike.flatMap(PairFlatMapFunction) (SPARK-668).
Merge branch 'master' of https://github.com/mesos/spark