This commit makes the ES6 module loader polyfill use Web Workers,
so that Babel doesn't block the browser from animating. It also
uses localStorage to cache the compiled results, only recompiling
on source changes, so it makes loading faster while developing noVNC.
This includes a vendored copy of the ES6 module loader, modified as
described above.
This updates the tests to work with the new structure, and removes the
old `utils/run_from_console.js` files in favor of just using Karma
directly. The Karma debug page now displays the normal mocha HTML, so
we can use that instead of the HTML generation functionality of the old
test runner.
Note that PhantomJS does not work at the moment (PhantomJS 1.5 should
make it possible to test on PhantomJS again).
Solly Ross