when local changes get pushed, `change` events from remote get triggered

To reproduce

```
// make sure that you have an account, if not run hoodie.account.anonymousSignUp()

// subscribe to remote changes
hoodie.remote.on('change', function() { console.log('REMOTE CHANGE', arguments) })

// Add a new object
hoodie.store.add('funk', {})

// wait 2s, then you'll see the `REMOTE CHANGE` in the console
```

This issue will become obsolete once we migrate to Pouch (#8), but I think I can fix this with a rather simple fix.