Ron Kok 08b0045b92 Support \cfrac (#1392) ...

* Support \cfrac

This was an easier PR to write than #135 since KaTeX now has well established methods for pt-to-em conversions and nulldelimiter.

As in #135, this does not support the LaTeX optional argument for numerator justification.  It supports a `\cfrac #1 #2 ` syntax.

* Added screenshotter files

* fix ref to context in genfrac handler

2018-06-03 16:38:19 -04:00

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