[FLINK-1139] Added FinalizeOnMaster hook to run code after the last task of an OutputFormat completed
[FLINK-1139] Fixed HadoopOutputFormat to run with DOP > 1

This closes #173
[FLINK-1139] Updated Hadoop Compatibility documentation
[FLINK-1311] [optimizer] Correctly tag static/dynamic path for auxiliary nodes in iterations.
[FLINK-1287] LocalizableSplitAssigner prefers splits with less degrees of freedom