Addon with a element throws Error

[Erik Pöhm]

When I set a addon with an element

addonBefore = { <i name="test" className='ion-person' /> }

It throws Uncaught TypeError: Converting circular structure to JSON, when I doesn't set a ID
I found that error is on this line, by hashing the addon prop
https://github.com/twisty/formsy-react-components/blob/master/src/mixins/component.js#L119

But I don't have a "clean" solution for this now.

[Tim Brayshaw]

Fixed, see #33.