* Add failing tests for tile order and length changes

* Expose didUpdate callback on grid-list update

* remove layout-padding remnant

* Sort tiles by dom order on grid-list didUpdate

* Add tests for basic grid-list attributes

1. For paper-input, validate only when its value changes. 
2. For paper-autocomplete, validate only when selection is changed.

)

Hi, I saw that this issue miguelcobain#791 hasn't been fixed yet. Here's a PR to fix it. I've added a test and an example of a disabled tab in the dummy app.

Deprecations Added in 3.4
Use closure actions instead of `sendAction`

https://emberjs.com/deprecations/v3.x#toc_ember-component-send-action

… files for now

…lcobain#794)

In the angular implementation, they allow you to customize the button by using a ["highlightClass"](https://github.com/angular/material/blob/v1.1.4/src/components/toast/toast.js#L174):

> If set, the given class will be applied to the highlighted action button.<br/>
> This allows you to specify the highlight color easily. Highlight classes are `md-primary`, `md-warn`  and `md-accent

1. For paper-input, validate only when value changes
2. For paper-autocomplete, validate when selection is made.