Djangocodemirror

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Enforce ``varname`` formatting for ``CODEMIRROR_FIELD_INIT_JS`` setting so it
should always be a valid Javascript variable name.

Concretely ``varname`` is slugified and dashes are replaced by underscores so
a given varname like ``foo codemérror-0`` is turned to ``foo_codemerror_0``.

This should be a safe change and resolve issues with usages inside a formset.
Thanks to abumalick for report.

Also added support with Django 2.2 and removed notices about major changes
from 2.0.0 version.

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**Add support for Django 1.11, 2.0, 2.1 and CodeMirror 5.40.2**

* Rewrite package to use ``setup.cfg``;
* Add support for Django 1.11, Django 2.0 and Django 2.1, close 22;
* Drop support for Django 1.8 and 1.9;
* Django 1.11 support is the last one for Python2;
* Change old demo project to more cleaner sandbox;
* Change widget to use new Django widget API;
* Upgraded included copy of CodeMirror to 5.40.2;

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* Added support from Django 1.9 to 1.10, close 18;
* Added support for Python 3.5, close 19;
* Dropped support for Django 1.6 and 1.7;

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* Added helper to change parameters on many configs, close 14;

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* Better explicit name for internal exceptions, close 16;

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* Validated support for Django 1.8 from tox tests;
* Allow to disable asset bundle on a configuration using None value on bundle names, close 15;