DOC: add section on groupby().rolling/expanding/resample#14801

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jorisvandenbossche merged 5 commits intopandas-dev:masterfrom

wandersoncferreira:master

Dec 10, 2016

Commits on Dec 5, 2016

documentation of groupby resample expanding
Wanderson
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removing foo
Wanderson
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Commits on Dec 8, 2016

updating feedbacks
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final modifications
Wanderson
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Commits on Dec 10, 2016

remove link to whatsnew (same content as link to groupby docs)
jorisvandenbossche
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