Curver

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* Now using a quadratic time algorithm to compute invariant multiarcs.
* Fixed bug in computing Mosher sequence.

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* Solves the conjugacy problem for periodic mapping classes.
* Computes quotient orbifold signature of periodic mapping classes.
* Finds invariant polygonalisations of periodic mapping classes.
* Switched to standard version number extraction.
* Switched documentation to use autosummary.
* Separated out Tox testing evnironments.
* Tox checks for print statements in the kernel.
* Mirgrated from NumPy matrices to arrays.

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* Typo hotfix.

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* Fixed API documentation build process and typos.
* Separated out Mappings from Encodings.
* Triangulation.surface now returns a dictionary.
* All moves can now be packaged.
* Standardised unittests.

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* Fixed twist homology action typo.

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* Minimise and shorten now only return encodings.
* Fixed shorten ordering bug.
* Fixed appveyor build process.