DOC add to_datetime to api.rst
WIP some to_datetime docs additions
WIP to_datetime docs more rewriting
FIX final tweaks
GH3969 Implement unit='D' in to_datetime
DOC: release notes
FIX: Bug in stata parser causing failure when reading dataset with string data
ENH add cython tutorial
FIX add cython to toctree
FIX remove todos

change name to Enhancing performance
add in some sections
DOC: put release notes link to dev until 0.11.1 is released
BUG  (GH3967) csv parsers would loop infinitely if ``iterator=True`` but no ``chunksize`` was

     specified (:issue:`3967`), python parser failing with ``chunksize=1``
TST: Change network decorator to auto-check for network errors

TST: Enforce more strict rules about ignoring IOErrors with network tests

ENH: Allow keyword arguments to network decorator

ENH: skip try/except checks if raise_on_error
TST: Remove explicit connectivity checks in test cases.

Instead, network decorator in pandas.util.testing checks
for that instead. You have to opt into failing on tests
by setting `pandas.util.testing._FORCE_NETWORK_ERROR` to `True`.

CLN: Move imports and test skip to top of file
ENH: Add test decorator 'with_connectivity_check'.

Allows tests to check that a url is available before bubbling up
an error from a test case.

TST: Change tests to use with_connectivity_check to better approximate previous behavior

TST: Add check_before_test option to with_connectivity_check.

CLN: PEP8 all the recent jratner code
DOC: Update docs with changes
FIX py3ing some print statements
CLN remove py3 note on print >>s
ENH: Experimental CustomBusinessDay DateOffset class. Fixes GH2301.
ENH: Added check for required version of Numpy.
ENH: Added holidays and weekmask arguments to cdate_range as suggested by
@jreback. Also improved docstrings.
TST: Copied existing tests for BusinessDay for CustomBusinessDay to test that
the CustomBusinessDay class can be used as a drop-in replacement of the
BusinessDay class.

TST: Added tests for the holidays and weekmask functionality of the
CustomBusinessDay class.

TST: Added checks to skip tests involving CustomBusinessDay when this class
isn't available due to numpy requirements not being met.

TST: Added tests for holidays and weekmask functionality in cdate_range.