[scala] Simplify Operation Classes: No more Impl Classes
Fix guava dependency in flink-streaming-core to allow IDE local testing.
[FLINK-514] Fixed javadoc problems
[FLINK-514] Fix additional javadoc problems and add suppressions for certain compiler warnings.
[streaming] Added CoBatchReduceInvokable, CoWindowReduceInvokable, CoGroupedBatchReduceInvokable, CoGroupedWindowReduceInvokable
[streaming] Reduce and GroupReduce invokable refactor and performance tweak
[streaming] ConnectedDataStream API  and operator cleanup + modified windowReduceGroup functionality
[streaming] Improved tests for CoReduceInvokables
Guava shading issue fix for Eclipse