Responses Tab doesn't show responses which were uploaded after the page is loaded

[cketcham]

Steps to reproduce:

1. Go to Response tab, choose the campaign, and press show responses.
2. upload response on the phone
3. press show responses again.

The new response is not shown. I would expect the new response to be at the top of the list.

[ghost]

Please add this starting at line 84 in edu/ucla/cens/mobilize/client/presenter/ResponsePresenter.java

// Campaign update handler
this.eventBus.addHandler(CampaignInfoUpdatedEvent.TYPE, new CampaignInfoUpdatedEventHandler() {
@OverRide
public void onCampaignInfoUpdated(CampaignInfoUpdatedEvent event) {
campaigns = event.getCampaigns();
}
});