--------------------------
This is a major refactoring to adopt Test Driven Development, cleaner behaviors and better core API.
* Added Unittests with Py.test;
* Added documentation, close 11;
* Added tox configuration to validate support for Django 1.6 and 1.7;
* Flake8 coverage;
* Rewrited every template tags and filters;
* Better docstring for code;
* Removed all stuff about reStructuredText editor addons;
* Removed everything about the CodeMirror rst editor (may probably live again in its own app);
* Removed deprecated templates;
* Replaced old Codemirror git submodule with a static copy from ``5.18.2`` version, close 9;
* Dropped ``mode`` as an internal parameter since CodeMirror can use it in many different ways (as a string for a name, as a string for a mime-type, as a dict of mode options);