API: Allow groupby's by to take column and index names [WIP]#7033

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TomAugspurger wants to merge 4 commits intopandas-dev:masterfrom

TomAugspurger:groupby-level-names

Commits on May 4, 2014

add the grouping code
Tom Augspurger
committed
add tests
Tom Augspurger
committed
refactor index resetting
Tom Augspurger
committed

Commits on May 5, 2014

add test [ci skip]
Tom Augspurger
committed