Add MathML support

[PowerMyLearningConnect]

We tried to convert the equations to Latex, with no success. We need MathML support added to pie to make sure that all CoreSpring imported items render properly.

Currently, Math renders with words instead of symbols in imported CoreSpring questions.

http://sbox.powermylearning.org/piedemo/MultipleChoice_Math_Example.html
https://github.com/paritoshcardinal/pie_elements_demo/blob/master/mc/math.json

[narayankj]

@edeustace We were able to convert MathML to latex. This issue is not a blocker anymore.

@Alex-Alberto

[edeustace]

Hi @narayankj - ok thanks good to know - it's still something that we are planning on adding but it's not as pressing anymore.