Fix bucket when not a brigade.
Add Hoa\Stream\Filter\LateComputed.

A late computed filter computes the data when closing the filtering.
[auto] Merge from Stream

    • #1843feb — Fix bucket when not a brigade. (Ivan Enderlin, 2013-09-13)
    • #4207961 — Add Hoa\Stream\Filter\LateComputed. (Ivan Enderlin, 2013-09-13)

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Merge remote branch 'library-stream/master'