Remove remaining jQuery from View tests

Now that #3003 is merged, we need an easy way for alternative View implementations to run against our View conformance test. This pulls jQuery out of the View tests except in for checking `view.$el instanceof Backbone.$` (which all jQuery-like apis should support).
Hey @wyuenho, how come we couldn't just use `element.click()` directly here? It'd obviate this messiness here. Only downside I see is that the element would have to live in the DOM already.