Bug: Grouping by index and column fails on DataFrame with single index (GH14327)#14333

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jonmmease wants to merge 9 commits intopandas-dev:masterfrom

jonmmease:bug_14327

Commits on Oct 2, 2016

Added failing test case of GH 14327
Jon M. Mease
committed
Handle specification of level for non-MultiIndex in Grouping constructor
Jon M. Mease
committed
Release notes for fix to GH 14327
Jon M. Mease
committed

Commits on Oct 3, 2016

Moved whatsnew to 0.20.0
Jon M. Mease
committed

Commits on Oct 5, 2016

Moved grouper level handling logic to methods on Index/MultiIndex (GH14327)
Jon M. Mease
committed
Improve comments for Index._get_grouper_for_level
Jon M. Mease
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Wrap line violating PEP8
Jon M. Mease
committed

Commits on Oct 6, 2016

Added test cases that group by column then index
Jon M. Mease
committed
Cleaned up _get_grouper_for_level implementations and added docstrings
Jon M. Mease
committed