Replace alert modal with something less obtrusive

Using an alert box is not the best UI.
See a good alternative here:
http://www.commandlinefu.com/commands/browse

![screenshot 2014-08-04 11 53 48](https://cloud.githubusercontent.com/assets/30460/3798689/30c7331e-1be7-11e4-80d6-204300beca6b.png)

Fades in and out
@pdewouters 

I think this is quite a nice solution - but whilst we want something that 'just works' out of the box, I'm generally wary about plugins adding a lot of dependencies. 

In this case - loads growl js, growl css & jquery. Some sites may not want to use jQuery for example and this would then be adding a lot of extra stuff.

However I think there is an easy fix for this!

If you were to remove this line, and instead fire a custom event - then your growl stuff can almost be a stand alone plugin for comment-popularity and any devs could very easily just dequeue it and hook their own solution in. 

Something like this - from the [jQuery docs](http://learn.jquery.com/events/introduction-to-custom-events/):

````
$( document ).on( "myCustomEvent", {
    foo: "bar"
}, function( event, arg1, arg2 ) {
    console.log( event.data.foo ); // "bar"
    console.log( arg1 );           // "bim"
    console.log( arg2 );           // "baz"
});
 
$( document ).trigger( "myCustomEvent", [ "bim", "baz" ] );
````

Also worth looking at - [namespacing events](http://api.jquery.com/event.namespace/)

What do you think? Just an idea.