DOC: Clarify what Categorical takes.
REF: Deprecate Factor for Categorical.
ENH/DOC: Allow levels=None for Categorical
TST: Test Categorical constructor with levels=None
DOC: Coherent english in docstring
TST: Test describe method of Categorical
ENH: Add a describe method to Categorical.
REF: Remove Factor alias left by mistake.
ENH: Add levels=None in deprecated class too.
DOC: Factor -> Categorical.
REF: Factor -> Categorical.
ENH add date to DatetimeIndex
document read_csv's usecols argument.
Merge pull request #3544 from lexual/read_csv_doc_usecols

document read_csv's usecols argument.
BUG: (GH3611) Fix read_csv to correctly encode identical na_values, e.g. na_values=[-999.0,-999] was failing
Merge pull request #3615 from jreback/read_csv_na_values

BUG: (GH3611) Fix read_csv to correctly encode identical na_values
BUG: (GH3617) Fix indexing issue with ndim >= 3 with iloc
Merge branch 'master' of https://github.com/PKEuS/pandas into PKEuS-master

Conflicts:
	RELEASE.rst
Merge pull request #3618 from jreback/iloc_broken

BUG: (GH3617) Fix indexing issue with ndim >= 3 with iloc
BUG: fixed platform int issues on 32-bit