ENH: raise a more a useful exception on empty files
Merge pull request #3989 from cpcloud/empty-csv-fix

ENH: raise a more a useful exception on empty files
CLN: fix invalid python26 exception specification
Merge pull request #4000 from cpcloud/fix-invalid-exception-spec

CLN: fix python26 invalid exception
Merge pull request #3999 from mtkni/stack_dropna

BUG: (GH3997) Fix for dropna=False in stack
Fix rename for MultiIndex columns DataFrame

Fix rename for MultiIndex columns DataFrame
Add a release note for #4004
Merge pull request #4004 from ogiaquino/Fix_rename_for_MultiIndex_columns_DataFrame

Fix rename for MultiIndex columns DataFrame
FIX groupby name without multiindex GH4014
Merge pull request #4015 from hayd/GH4104_groupby_index_name

FIX groupby name without multiindex GH4104
TST: mark test_yahoo/test_options as failing (and skip)
TST: correctly mark test_options in test_yahoo to skip
BUG: Use Series.where rather than np.where in clip