Nodeunit tests do not run in the browser

[mikebolt]

When run in the browser this error appears in the console and no tests run:

Cannot read property 'textareas' of undefined

Same error in Chrome, Firefox, Edge, and IE.

[mikebolt]

Tested in Safari also.

The version of nodeunit.js that our nodeunit.html points to is in nodeunit's "examples" directory and it appears to be out of date. Running "make browser" inside the nodeunit folder then pointing it to the assembled nodeunit.js file fixed the issue.

We should find a way to keep nodeunit.js up to date.

If you're lazy, you can change nodeunit.html:

nodeunit.run({
    'tween': getTests(TWEEN)
}, {});

Add an empty object as a second parameter.

[mikebolt]

Fixed in #339.