Update $animate service to accept native dom elements as well as jqLite objects

Request Type: docs

How to reproduce: 

Component(s): ngAnimate

Impact: small

Complexity: small

This issue is related to: 

**Detailed Description:**

simply `$animate.addClass` and the like only resolve for javascript defined animations if passed a jqLite object. Passing a native dom object does not work. This nuance needs to be documented.

**Other Comments:**

`$animate` only seems to work if passed a `jqLite` object, native dom elements do not work. This should be documented.