(chore) update Polymer

Update Polymer and change references of platform.js to webcomponents.js.
(feat) add Angular Aria support

ng-poly:app now asks if Angular Aria should be included, if Angular 1.3
is selected. app.{coffee,js} automatically has ngAria as a dependency.
(chore) update generated dependencies
(chore) update package description
(chore) bump version to 0.4.13