Accordion.Item propTypes are incorrect

[sodiumjoe]

onToggle should be omitted from Accordion.Item propTypes. i.e. Accordion.Item should be a new child component defined in Accordion.jsx, that renders an ExpanderPanel, instead of being a direct reference to ExpanderPanel

[mute]

I started on this but I realized that I'm not totally sure what we're trying to address with this bug.

I don't see Accordion.Item mentioned in the docs here: http://appnexus.github.io/lucid/#/components/Accordion

Can you add some additional context for the issue?