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.
TST: Test Series.sort with ascending
ENH: Allow sorting of Series in ascending order
ENH: examples for release notes and fix up nested dict example and test

fix up rough edges of docs and add a more thorough test for nested dicts

fix unintended example
DOC: correct mpl_style option name in whatsnew.html GH3640
DOC: CONTRIBUTING.md
TST: issue (#3628) when writing a dataframe column of integers to sqlite
BUG : issue (#3628) when writing a dataframe column of integers to sqlite
API: Raise on ``iloc`` indexing with a mask boolean that is not an ndarray (GH3631_)

     PTF

TST: added @snth test harness

DOC: doc updates for release notes,indxing.rst and v0.11.1
CLN: added NotImplementedError when trying to iloc with a mask that has an integer index

     (rather than ValueError)