Tests: Replace resource loader with AMD

[scottgonzalez]

Replaces gh-1335.
Replaced by gh-1528.

This reduces the changes to only affect the accordion test suite so it's easier to discuss and make changes.

• Simplify per-test boilerplate
• Convert domEqual() to a real assertion
• Replace custom QUnit.assert.close() with qunit-assert-close module
• Move domEqual() to its own module
• Properly update QUnit (can now be done by rebasing on master)
• Update all tests (currently just accordion)
• Remove globals from tests/.jshintrc
• Figure out how to use AMD in grunt-contrib-qunit
• Pull in domEqual() changes from Null attributes #1516
• Update grunt-contrib-qunit and use the bridge from there (Adjust bridge for use with AMD gruntjs/grunt-contrib-qunit#94)

[jzaefferer]

Reproducing a comment from the original PR, still need to do that:

Can we smash all the files in test/unit/helper/ into one js file? I don't see the point in splitting those up when we use them on every page. And you can get rid of the window.require dependency by exporting the right variable: http://requirejs.org/docs/api.html#config

var require = { ... };

Would also remove the need to export window.helper.jqueryUrl at all, since you could just use that directly.

[scottgonzalez]

This is ready for a review. I've made a lot of changes from the original implementation. The new implementation significantly reduces the boilerplate for each test.

[scottgonzalez]

grunt-contrib-qunit doesn't support AMD 😢

[arschmitz]

Just went through this with @scottgonzalez on skype every thing looks good.

👍

We also talked about once this lands, seeing what we can extract here including the helpers and common tests to share with mobile.

[jzaefferer]

Updated master to QUnit 1.18.0.

[scottgonzalez]

Great. I've got a few other tasks to work on right now, but I'll finish this up soon.

[scottgonzalez]

I've squashed most of these commits and rebased on master. New PR is at #1528.