Calendra

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- Added Singapore calendar, initiated by nedlowe (194 + 195).
- Added Malaysia, by gregyhj (201).
- Added Good Friday in the list of Hungarian holidays, as of the year 2017 (203), thx to mariusz-korzekwa for the bug report.
- Assigned a minimal setuptools version, to avoid naughty ``DistributionNotFound`` exceptions with obsolete versions (74).
- Fixed a bug in Slovakia calendar, de-duplicated Christmas Day, that appeared twice (205).
- Fixed important bugs in the calendars of the following Brazilian cities: Vitória, Vila Velha, Cariacica, Guarapari and Serra - thx to Fernanda Gonçalves Rodrigues, who confirmed this issue raised by Skippern (199).

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Correct usage in example.

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Fixed issue 4 where Finland holidays were shifted but shouldn't have been.
Calendars and Holidays may now specify observance_shift=None to signal no
shift.

Package can now be tested with pytest-runner by invoking ``python setup.py
pytest``.

- Moved all the calendar of countries on the american continent in their own modules (188).
- Refactor base Calendar class get_weekend_days to use WEEKEND_DAYS more intelligently (191 + 192).
- Many additions to the Brazil and various states / cities. Were added: Acre, Alagoas, Amapá, Amazonas, Bahia, Ceará, Distrito Federal, Espírito Santo State, Goiás, Maranhão, Mato Grosso, Mato Grosso do Sul, Pará, Paraíba, Pernambuco, Piauí, Rio de Janeiro, Rio Grande do Norte, Rio Grande do Sul, Rondônia, Roraima, Santa Catarina, São Paulo, Sergipe, Tocantins, City of Vitória, City of Vila Velha, City of Cariacica, City of Guarapari and City of Serra (187).
- Added a ``good_friday_label`` class variable to ``ChristianMixin`` ; one can assign the right label to this holiday (187).
- Added a ``ash_wednesday_label`` class variable to ``ChristianMixin`` ; one can assign the right label to this holiday (187).

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Fix name of Finnish Independence Day.