Cssutils

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Minor cleanup.

Restored package version reporting when fetching URLs.

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Adopted `jaraco/skeleton <https://github.com/jaraco/skeleton>`_.

Delinted codebase.

Removed ``cssutils.VERSION`` and ``cssutils.__version__``.
Consumers wishing to know the version should use
``importlib.metadata.version('cssutils')``.

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New `maintainer <https://pypi.org/user/jaraco>`_ revives the project
and moves `hosting <https://github.com/jaraco/cssutils>`_ with
continuous integration testing.

Refreshed packaging.

Project now requires Python 3.6 or later.

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Undocumented changes.

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Undocumented changes.

- EXPERIMENTAL: Variable references may have a fallback value now (as implemented in Firefox 29). It is available as ``CSSVariable.fallback`` and example are::

bottom: var(b);
color: var(theme-colour-1, rgb(14,14,14));
left: var(L, 1px);
z-index: var(L, 1);
top: var(T, calc( 2 * 1px ));
background: var(U, url(example.png));
border-color: var(C, f00)

- FEATURE: (Bitbucket 37) Implemented parsing of ``CSSCalc`` values. General syntax is checked but not if operators in calc are actually the right kind like DIMENSION * DIMENSION. Also Values using calc do not validate in cssutils but are actually valid.

- FIXED Bitbucket 20 and Bitbucket 35 (Test fail CSSParser.parseUrl() error with Python 3.3)

- FIXED Bitbucket 21: (almost all) deprecation warning in Py 3.3 fixed.

- FIXED Bitbucket 30 (Test failed)

- FIXED Bitbucket 33 (well kinda): Added that cssutils is **not** threadsafe!

- FIXED Bitbucket 34: More complext MediaQueries should be parsable now. A few slight changes in behavior are:
- ``xml.dom.SyntaxErr`` raised instead of ``xml.dom.InvalidCharacterErr`` for an unknown media type
- removed ``handheld`` media type special case (for old Opera).