Calendra

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Fixed issues with packaging (disabled installation an zip egg and now use
setuptools always).

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UnitedKingdom Calendar now uses indicated/observed Holidays.

- Added Cyprus. thx gregn610 (174).
- Added Latvia. thx gregn610 (178).
- Added Malta. thx gregn610 (179).
- Added Romania. thx gregn610 (180).
- Added Canton of Vaud (Switzerland) - brutasse (182).
- Fixed January 2nd state holiday (181).
- Fixed Saxony repentance day for the year 2016. thx Natim (168).
- Fixed Historical and one-off holidays for South Africa. thx gregn610 (173).
- Minor PEP8 fixes (186).

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Initial release of Calendra based on Workalendar 0.2.

- Adds Holiday class per (79). Adds support for giving
holidays a more rich description and better resolution of observed versus
indicated holidays. See the pull request for detail on the motivation and
implementation. See the usa.UnitedStates calendar for example usage.

- Add Ireland. thx gregn610 (152).
- Bugfix: New Year's Eve is not a holiday in Netherlands (154).
- Add Austria. thx gregn610 (153)
- Add Bulgaria. thx gregn610 (156)
- Add Croatia. thx gregn610 (157)

- Reformation Day is a national holiday in Germany, but only in 2017 (150).