rename limiter to throttle and refactor

- don't inject raf/setTimeout since we can't really mock them w/ a good degree of timing accuracy anyways

fix some unrelated tests

test-utils/tests/test-domMock.js

@@ -533,7 +533,7 @@ o.spec("domMock", function() {
 			o.beforeEach(function() {
 				spy = o.spy()
 				div = $document.createElement("div")
-				e = $document.createEvent("AnimationEvent")
+				e = $document.createEvent("HTMLEvents")
 				e.initEvent("transitionend", true, true)
 				
 				$document.body.appendChild(div)