Pyramid-localize

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- [packaging] use setup.cfg to define package metadata nad options

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- [dropped deprecation] removed request.locale in favour of pyramid's request.locale_name
- [breaking] Removed dependency on tzf.pyramid_yml. Now all settings should be
set in the standard ini file.
- [enhancement] Drop support for python 2
- [dependency] Require pycountry at minimum 18.12.8, due to API change
- [functionality] Language object's name and native_name will filled automatically
on language creation from pycountry [rmed]

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- weaker pyramid_yml requirements. Use ``registry['config']`` instead of ``request.config`` which gets added only when explicitly including tzf.pyramid_yml package.
- deprecated request.locale in favour of request.locale_name delivered by Pyramid 1.5
- moved locale negotiator into it's own submodule

backward incompatible
+++++++++++++++++++++
- required cookie name changed to _LOCALE_ to be consistent with other places
- fixed a typo from catalog to catalogue

tests
+++++
- refactor tests to pytest
- introduced pylama checks for:
- pep8
- pyflakes
- pep257
- mccabe

- license information
- requires at least pyramid 1.5a1 (rely on default localizer reify method)
- py3 compatibility (require at least babel 1.0)
- locale negotiator looks first for request attribute _LOCALE_
- added pyramid_mako dependency (required by pyramid 1.5a2 changes)

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- fixes in catalog/index template [zusel, fizyk]
- destination path added in translation_dirs as a translation source as well [fizyk]

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- fix issue with translation files path beeing not related to cwd [fizyk]

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- fixed MANIFEST.in [fizyk]