Squashed 'src/lib/JS-Algebra/' changes from fb4ed5a..e378e98

e378e98 Better MathML output: Now with fractions!

git-subtree-dir: src/lib/JS-Algebra
git-subtree-split: e378e98a0a41304071d61115a5848438a7eab70c
Merge commit '4baaaeaebb615f130ff87ffbf6509afc06062b7c'
Fractions! Amazing wonderful fractions!