FIX raise when groupby selecting cols not in frame
PERF: dataframe.from_records: read into list w/ itertools.islice when specifying nrows #6700
BUG: Use reversed to check for list
TST: simply some yahoo network tests
Merge pull request #6790 from jreback/slice

BUG: bug in taking all on a multi-index when only level 0 is specified (GH6788)
DOC: Improve doc-string for `copy` kw on `convert_object()` (GH1234)
Merge pull request #6791 from ankostis/master

DOC: Improve doc-string for `copy` kw on `convert_object()` (GH1234)
Merge pull request #6765 from TomAugspurger/lazy-iteritems

BUG: Use `reverse` to check for non-lazy
BUG: duplicate (getitem) indexing with iloc (GH6766)
Merge pull request #6799 from jreback/iloc_dups_1

BUG: duplicate (getitem) indexing with iloc (GH6766)
BUG: fix metacharacter replacement bug in DataFrame.replace()
StataWriter: Replace missing values in string columns by an empty string
Merge pull request #6778 from cpcloud/regex-false-replace

BUG: fix metacharacter replacement bug in DataFrame.replace()
BUG: bug in timedelta ops on 32-bit platforms (GH6808)
BUG/ENH: Fix to_excel representation of inf values
Merge pull request #6812 from jtratner/excel-inf

BUG/ENH: Fix to_excel representation of inf values
BUG/API: disallow boolean arithmetic operations
CLN/TST: move ops test from test_frame.py to test_expressions.py
BUG: check for dtype attr then check block types if no dtype attr
Merge pull request #6803 from cpcloud/bool-arith-ops-6762

BUG/API: disallow boolean arithmetic operations