Nativescript integration

**I'm submitting a feature request**

**Current behavior:**

Nativescript has a Typescript / Angular2 integration to allow for building mobile apps with Angular2, but no integration with Aurelia. The Nativescript / Angular2 integration is discussed here: https://www.nativescript.org/nativescript-is-how-you-build-native-mobile-apps-with-angular

**Expected/desired behavior:**

Implement an equivalent integration with Nativescript for Aurelia (either Typescript or ES6)

* **What is the motivation / use case for changing the behavior?**

There's currently no good way to build mobile apps with Aurelia as Cordova is often too slow to be useful. This would provide a good semi-native framework for building mobile apps using Aurelia.

Start by reviewing the linked NativeScript/Angular2 integration reference and the Aurelia framework entry point. Define the required Aurelia integration surface and confirm that a working NativeScript mobile application can be built with Aurelia using TypeScript or ES6.

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