Test: Implement universal module setup/teardown

[leobalter]

This implements the equivalent of setup/teardown methods that are define once for the entire testsuite, but run for each test. To make this easier to understand, we've went from setup/teardown to beforeEach/afterEach, renaming the existing module properties at the same time (in a separate commit).

Fixes #633

[JamesMGreene]

Just took a very quick look but seems good to me.

[leobalter]

this translate object is temporary until we deprecate and remove QUnit.module's setup/teardown names for beforeEach/afterEach

[jzaefferer]

I didn't yet run this test, so something may be wrong, but it should work like this:

QUnit.config.beforeEach = function( assert ) {
  assert.deepEqual( Object.keys( this ), [ "helper" ] );
};
QUnit.module("context object", {
  beforeEach: function( assert ) {
    assert.deepEqual( Object.keys( this ), [ "helper" ] );
    this.prop = "foobar";
  },
  helper: function() {}
});
QUnit.test("keys", function( assert ) {
  assert.deepEqual( Object.keys( this ), [ "helper", "prop" ] );
});

See also qunitjs/api.qunitjs.com#63

[jzaefferer]

I'm okay with renaming these methods, but the "each" part doesn't really make sense, since they are called just once for each Test instance. We can also just leave the names as-is (Test#setup and Test#teardown), since these have a completely different scope. If we rename, then "before" and "after" should be good.

[leobalter]

Rebased with suggested changes:

• globalSetup is now hooks
• Test prototype internal methods setup and teardown were renamed to before and after.
• beforeEach and afterEach methods are only seen on the external api as the module's hooks

[jzaefferer]

Looks good, let's land it.

[jzaefferer]

Now we just need the API docs to land when we release 1.16.

[JamesMGreene]

Late to the party but just a note: I'm glad we chose "hooks" as that is consistent with Mocha's terminology.

[leobalter]

@JamesMGreene we checked on their documentation before choosing the name.

[JamesMGreene]

\o/