Fixes #881 - Export component prototype methods on the HTMLElement

Here's a first pass. I kinda like the way this API feels -- it's important here that we're pretending the `can.Component` prototype is the `HTMLElement` prototype (with a couple of exceptions for other options).

See the test case for other/various little details about how this works.
Unless your benchmark involves defining thousands of individually-named components with hundreds of exported functions each, I'm not sure this would ever be a problem, so I'm not sure it's worth the price of using this optimization.