Latexcodec

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* Fix underscore "\\_" encoding (see issue 17, reported and fixed by
Michael Radziej).

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* Drop Python 3.2 support.

* Drop 2to3 and instead use six to support both Python 2 and 3 from a
single code base.

* Fix control space "\\ " decoding.

* Fix LaTeX encoding of number sign "" and other special ascii
characters (see issues 11 and 13, reported by beltiste).

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* Copied lexer and codec from sphinxcontrib-bibtex.

* Initial usage and API documentation.

* Some small bugs fixed.

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* Adding additional codec with brackets around special characters.

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* Initial release.