Moved merge&split method into IteratorResult. Fixed python logs levels.
Added handling Ctrl+C from detached processes. Added timeout for fetching results from proccesses.
Added handling Ctrl+C in dc2. Fixed skipping equal keys while computing differences between iterator result container.
Merge pull request #132 from shaitan/master

Fixed computing diff. Moved merge from dc/dc2 to iterator. Applied fixes for handling Ctrl+C.