Added to docstrings in factorize function
CLN: removed Panel.fillna, replacing within core/generic.py/fillna
Merge pull request #4951 from jreback/fillna

CLN: removed Panel.fillna, replacing within core/generic.py/fillna
BUG: Conflict between thousands sep and date parser.

Fixes issue where thousands separator could conflict with date
parsing.

This is only fixed in the C parser.

Closes issue #4678
BUG: fix issue #4678 for Python parser
TST: Tests for fillna on empty Series (GH4346), thanks @immerrr
BUG: fix incorrect TypeError raise

TypeError was being raised when a ValueError was raised because the
ValueError's message wasn't being converted to a string.
Merge pull request #4957 from cpcloud/hdfstore-append-error-fix

BUG: fix incorrect TypeError raise
BUG: Fix copy s.t. it always copies index/columns.

Only copies index/columns with `deep=True` on `BlockManager`. Plus some
tests...yay! Change copy to make views of indices.

Requires changing groupby to check whether indices are identical, rather
than comparing with `is`. Plus add tests for name checks through
everything. Also, fixes tests to use `is_()` rather than `is`

CLN: Change groupby to use 'is_' instead
ENH: enable deep copy for sparse Series/Panel
CLN: PEP8 tests/test_index.py and core/index
Merge pull request #4830 from jtratner/copy-index-and-columns

BUG: Fix copy s.t. it always copies index/columns.
DOC: remote_data.rst: Fama/French punctuation
Merge pull request #4965 from westurner/patch-1

DOC: remote_data.rst: Fama/French punctuation
BUG: fix skiprows option for python parser in read_csv
API: raise a TypeError on invalid comparison ops on Series (e.g. integer/datetime) (GH4968)
CLN: do not use mutable default arguments
Fixes issue #4967
Merge pull request #4970 from jreback/invalid_compare

API: raise a TypeError on invalid comparison ops on Series (e.g. integer/datetime) GH4968
Merge pull request #4966 from cpcloud/scatter-matrix-kwargs

CLN: do not use mutable default arguments