Yayarl

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* Support more verbose error messages in ``.with_query()`` (24)

* Don't percent-encode ` and ``:`` in path (32)

* Don't expose ``yarl.quote`` and ``yarl.unquote``, these functions are
part of private API

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* Accept not only ``str`` but all classes inherited from ``str`` also (25)

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* Accept ``int`` as value for ``.with_query()``

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* Explicitly use UTF8 encoding in setup.py (20)
* Properly unquote non-UTF8 strings (19)

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* Don't use namedtuple fields but indexes on URL construction

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* Inline ``_encode`` class method