Add the Hoa\Iterator\Demultiplexer iterator \o/.

Demux result from another iterator. This iterator is somehow the
opposite of the Hoa\Iterator\Multiple iterator.
[auto] Merge from Iterator

    • #8132248 — Add the Hoa\Iterator\Demultiplexer iterator \o/. (Ivan Enderlin, 2013-05-27)

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Merge remote branch 'library-iterator/master'