[FLINK-1265] Fix user classloader bug for registerInputOutput() method
[Flink-1262] inconsistency between CsvReader.java and TupleGenerator.java

This closes #222
[FLINK-1264] [compiler] Properly forward custom partitioners to the runtime
[FLINK-820] [compiler] Support for disconnected data flows
[APIs] Enhance test coverage for CollectionInputFormat and add tests for failed serializations of user code objects
[FLINK-1263] [optimizer] Implement compatibility checks for binary operators and custom partitioning