Use ngResource for breeds

[stevecass]

This uses ngResource to make the Breed model act a bit like an ActiveRecord model resource mapped to an API. ngResource handles the mapping to a standard Rest API and provides instance methods like $save along providing the equivalent of ActiveRecord "class" methods. So

ngResource	AR
Breed.query	Model.all
Breed.get(:id)	Model.find(:id)
breed.$save	model_instance.save (if new_record?)
breed.$update	model_instance.save (if not new_record?)

One potential wrinkle working with rails is that the default save doesn't distinguish between new and saved records. So we can add an override.

  var Breed = $resource('https://stark-harbor-5038.herokuapp.com/breeds/:id', { id: '@id' }, {
    create: {
      method: 'PATCH'
    }
    update: {
      method: 'PATCH'
    }
  });

So our breed instances have $update and $create attached to them. To keep with the AR program we're also implementing a save (no $ prefix) method on the instance to call either create or update depending on the instance state.

https://docs.angularjs.org/api/ngResource/service/$resource