Add timeout to loading sentimental comments

It would be good to use some form of pubsub for this.

Unfortunately we can't as the open module uses a [boot script](http://open-module.appspot.com/boot.js) that doesn't use promises, so [our enhancer](https://github.com/guardian/frontend/blob/master/common/app/assets/javascripts/components/enhancer/enhancer.js) cannot use the `.then` or even callbacks to tell us when the XHR response is complete.

As this is an experimental feature, and needs fixing post haste, a `setTimeout` will do.

![TIMEOUT!](http://26.media.tumblr.com/tumblr_m0nnu3WW4j1qap9uuo1_500.gif)