Allow Hit Testing ScrollList Items via API

Problem
-------

Need to be able to hit test scroll list items.

Solution
--------

Add a method to the api.

Unit Tests
----------

Yes

How To +10/QA
-------------

- Travis CI should pass.

@lancefisher-wf @robbecker-wf @patkujawa-wf @georgelesica-wf @tomconnell-wf @todbachman-wf 
I assume these methods were not used by consumers, but this would technically be a breaking API change. We're still in 0., though, so 0.8.1 or 0.9.0 doesn't much matter I guess.