Grouping Module Change Log

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======================= Trunk (not yet released) =======================

Optimizations

LUCENE-3468: Replaced last() and remove() with pollLast() in
             FirstPassGroupingCollector (Martijn van Groningen)

API Changes

LUCENE-3483: Move Function grouping collectors from Solr to
             grouping module. (Martijn van Groningen)

New features

LUCENE-3496: Support grouping by DocValues. (Martijn van Groningen)