MathML in STS Viewer

[wendellpiez]

Currently, MathML is silently dropped in the STS Viewer, when it could be passed through for a script to pick up and render.

Doing better requires at least a small but valid example of MathML as well as a best-of-breed script.

• [ ] Make up little example
• [ ] Find, cache (if appropriate) and wire up script
• [ ] Test

[wendellpiez]

The STS Checker should also find and display any and all MathML.