Fix ChangeEventPlugin Dependencies

When React moved to attaching top-level event listeners on-demand, not all of the dependencies for `ChangeEventPlugin` were set. This led to `onChange` events not firing under certain circumstances. For example, listening to `onChange` on a checkbox will not work because it relies on `onClick` (unless something else on the page was listening to `onClick`).
Add span property to React DefaultDOMPropertyConfig

So that the `span` attribute on <colgroup> tags isn't swallowed by
React.