Marca-hypertext-math-to-HTML

Hypertext+math-to-HTML for Marca.

I am too lazy to explain hows and whys.

TODO

• accessibility;
• clipboard support;
• ensure searchability;
• selection of sub-expressions;
• legend (tooltips?);
• width/height sufficient for old browsers? (CSS transforms...)
• browserification;
• API review;
• documentation;
• tests.