Inject ReactDefaultBatchingStrategy

I'm not sure why this is the case, but any time I navigated (either using a link or popState) using the router, I would get the following error:

`Invariant Violation: ReactUpdates: must inject a batching strategy`

This seems to fix it, though I'm not sure why it was a problem in the first case. Not sure if this is a good fix or if there is something else wrong with my setup, as we're using react with addons.