Use minified Transcrypt output

[serin-delaunay]

The Transcrypt compiled JS files aren't too large (less than 200KB), but there's a lot of whitespace that could be removed.
index.html refers to the non-minified version at __javascript__/cmtq_web.js, and the minified version will be at __javascript__/cmtq_web.min.js. I can't just replace the link in the repo because my development machine doesn't have Java (which Transcrypt's minification depends on).

Probably the best way around this would be to set up Travis to use Webpack.