Add present object to params and use sendEvent

[offirgolan]

@poteto since I was passive aggressively asked not to commit to master... 😅

This PR has a couple of things:

• Setup dummy app with an example to use + setup changelog + release
• Initial readme setup (just the skeleton of it, nothing else really)
• Add the present param to the passed args so you can quickly gage if there have been changes from the defaults. This sort of goes into how or if we wanna manage some sort of state object. For example, keep an object on the controller such as qParams.sortDirection.hasChanged or qParams.hasChanged.
• Use sendEvent so we can use Ember.on

onQueryParamsDidChange: Ember.on('queryParamsDidChange', function({ changes, queryParams, routeName }) {
  this.get('metrics').trackEvent(assign({
    event: 'Query Params Changed',
    routeName,
  }, queryParams))
})

I really like this because you can now tap into this 'event' from a mixin, extends, or even an initializer to do something send over metrics via google analytics.