API: clarify DataFrame.apply reduction on empty frames#6007

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wolever wants to merge 4 commits intopandas-dev:masterfrom

wolever:add_apply_is_reduction

Commits on Jan 20, 2014

Commits on Jan 21, 2014

Fix apply on empty DataFrame returns DataFrame
wolever
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Commits on Jan 24, 2014

Add changelog notes and examples
wolever
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