Fixed get_address_ranges.
Merge remote-tracking branch 'upstream/master'
Removed useless variable.
Merge remote-tracking branch 'upstream/master'
Added support of multirange iteration. Updated C++ interface for iterator.

Added methods for pausing, continuing and canceling iterator.
Changed start_iterator: replaced dnet_iterator_request in parameters.
Fixed iterator.py for using new iterator interface.
Fixed merge.py for new iterator interface.
Merge pull request #105 from shaitan/master

Multi-range iterators