Support for math formulas in docx files

[marromlam]

closes #289

[afourney]

This is pretty neat. I know it's marked as draft, but I'd be interested to include it when ready.

On that note, can you add some unit test cases -- at your convenience -- so that formulas can be included in the continuous integration testing pipeline?

[marromlam]

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[marromlam]

@afourney this should be ready for review

[afourney]

I've just done a large refactoring, that will make this PR hard to merge directly. If you get it working with your branch, (adding those two missing files), I will handle the merge conflict -- don't worry.

[sathinduga]

This is a really helpful function. Waiting for the PR to be merged. Thanks @marromlam and @afourney for working on this.

[afourney]

I think these files are still missing?

[marromlam]

Added those missing files @afourney

[afourney]

Thanks. The code has since advanced, and introduce some merge conflicts. I will try to work through those tomorrow, or later this week, and I'll let you know if I run into any trouble.

The main issue, is that I'd like to perform these operations in-memory. It's tricky though, because you are rewriting the zip file. I think it can still be done though!

[afourney]

Oh, and where do those files originate @marromlam? I'll need to be careful about copyrights etc.

[marromlam]

ooml2mml.xsl is shipped with MS Office in the resources folder, and I imagine it is used by MS Word to do those kind of conversions.

The other xsl files were taken from: http://www.raleigh.ru/MathML/mmltex/index.php?lang=en
however these are no longer available in that link. Googling those, they appear in different sites.