Updated .gitignore
Latest version

In sync with the `gh-pages` branch. Of note: the `theorems.py` pandoc
filter.
Fix loader.js
Remove build from master
Updated .gitignore

Keep local `test.json` for messing with pandoc filters, ignore MathJax
Typo fixed in G-set example
Merge pull request #1 from maxlieblich/master

test