pre-merge commit
Squashed 'src/lib/JS-Algebra/' changes from 007e69e..eb73ac7

eb73ac7 added variable prefix to mathml export

git-subtree-dir: src/lib/JS-Algebra
git-subtree-split: eb73ac7b5aa5142d1797348ba0e7ab0c78d733b4
Merge commit '317f95a99d95e887c1795b05933f227b9fe8724e'
Variable IDs work now.
Squashed 'src/lib/JS-Algebra/' changes from eb73ac7..f752c65

f752c65 bug fix in html export

git-subtree-dir: src/lib/JS-Algebra
git-subtree-split: f752c6547ebd611e06c840c34dac2760c5c9756b
Merge commit '6f5105911ed0703f1f52b344553d0cabb9afa783'
.gitignore changes