Yarg

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Bug fixes
~~~~~~~~~

- :meth:`yarg.get` will now raise an Exception for errors **including**
300 and above. Previously only raised for above 300.
- Fix an issue on Python 3.X and PyPy3 where
:class:`yarg.exceptions.HTTPError` was using a method that was
removed in Python 3.
- Added dictionary key lookups for `home_page`, `bugtrack_url`
and `docs_url`. Caused `KeyError` exceptions if they were not
returned by PyPI.

Other
~~~~~

- More test coverage.

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API changes
~~~~~~~~~~~

- New :class:`yarg.package.Package` property `has_wheel`.
- New :class:`yarg.package.Package` property `has_egg`.
- New :class:`yarg.package.Package` property `has_source`.
- New :class:`yarg.package.Package` property `python_versions`.
- New :class:`yarg.package.Package` property `python_implementations`.
- Added :class:`yarg.exceptions.HTTPError` to :mod:`yarg.__init__`
for easier access.
- Added :meth:`yarg.json2package` to :mod:`yarg.__init__` to expose it for
use.

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- Initial release