Log Message:
Version 2.6.1
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- Updated zoneinfo file to 2017b.
- Added Python 3.6 to CI testing
- Removed duplicate test name that was preventing a test from being run.
- Fixed testing of folds and gaps, particularly on Windows
- Fixed deprecated escape characters in regular expressions.
- Many PEP8 style violations and other code smells were fixed.
- Improved performance of tzutc and tzoffset objects.
- Fixed issue with several time zone classes around DST transitions in any
  zones with +0 standard offset (e.g. Europe/London)
- Fixed issue with fuzzy parsing where tokens similar to AM/PM that are in the
  end skipped were dropped in the fuzzy_with_tokens list.
- Fixed issue with parsing dates of the form X m YY.
- Added support for parser weekdays with less than 3 characters.
- Fixed issue with the addition and subtraction of certain relativedeltas.
- Fixed issue where the COUNT parameter of rrules was ignored if 0.
- Updated documentation to include the new tz methods.
- Update documentation to reflect that the parser can raise TypeError.
- Fixed an incorrect year in a parser doctest.
- Moved version information into _version.py and set up the versions more
  granularly.