refactor(isArray): use Array.isArray exclusively

IE9 supports Array.isArray so we don't need a polyfill any more.
perf(jqLite): optimize event handler
perf($compile): don't register $destroy callbacks on element-transcluded nodes

This is a major perf win in the large table benchmark (~100ms or 9).

This cleanup is needed only for regular transclusion because only then the DOM hierarchy doesn't match scope hierarchy
(transcluded scope is a child of the parent scope and not a child of the isolate scope)

We should consider refactoring this further for the case of regular transclusion
and consider using scope events instead.
perf(jqLite): simplify jqLiteDealoc

while querySelectorAll is much more expensive than getElementsByTagName on elements with
both many and few children, cloning the live node list returned by getElementsByTagName
makes it as expensive as querySelectorAll (we need to clone because we need the node list
not to change while we iterate over it).

the childNodes and childNodes.length check is as expensive as querySelectorAll on a node
without any children, so it only makes the whole lookup 2x as slow, so I'm removing it.