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As of gh-2338, if one has loaded the jQuery MouseWheel plugin, the `mousewheel`
handler would fire the `wheel` one, but the `wheel` one would also run in
response to the native `wheel` event, resulting in double the distance handled
by the spinner. To prevent the issue, only fire the `wheel` handler from inside
the `mousewheel` on if the event was triggered by jQuery - jQuery will not care
that the underlying event is `wheel` and will only fire handlers for
`mousewheel`.
Also, add an iframe test using jQuery MouseWheel to not affect all the other
tests.
Plus, migrate from `QUnit.reset` to `QUnit.done` (see qunitjs/qunit#354).
Closes gh-2342
Ref gh-2338
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