BUG: pivot_table raises KeyError with nameless index and columns
PERF: speed up multi-key groupby
Merge pull request #8103 from sinhrks/pivot_dt

BUG: pivot_table raises KeyError with nameless index and columns
Merge branch 'groupby-speed-up' of https://github.com/behzadnouri/pandas into behzadnouri-groupby-speed-up
TST: Fix timezone test to avoit dateutil issue
BUG: comparison of category vs np dtypes buggy (GH8143)
Merge pull request #8099 from sinhrks/gh7993

TST: Fix timezone test to avoit dateutil issue
TST: windows test fix re GH8103
CI: change nose to be 1.3.4
Merge pull request #8146 from jreback/cat_dtype

BUG: comparison of category vs np dtypes buggy (GH8143)
BUG: scatter with errorbar raises IndexError