fix component update bug #103
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Issue: virtual-dom doesn't seem to compare two widgets for equality based on key - or at least, if one key is undefined and the other isn't they're compared as equal and the component is updated, not calling the
onaddevent.Secondly, if two components have different constructors but undefined keys, then they're considered equal. This is more of a hyperdom issue.
In any case, in this patch we compare the keys and constructors before deciding whether to update or create a component.