Property 'inherited' does not exist on type <...>

Hi,

I'm looking into seeing if I can convert an existing Dojo project to TypeScript using these typings and I'm having trouble calling `this.inherited(arguments)` in classes that I am declaring.

To reproduce, simply add the following to the Dialog class definition in the example/basicApp project:
```javascript
destroy() {
this.inherited(arguments);
}
```

which gives the error "src/app/Dialog.ts(24,8): error TS2339: Property 'inherited' does not exist on type 'Dialog'" rather than just working.

Is there a different way to call the base classes method from an inheriting class? I can't seem to find any references of how to do this in the repository.

```
tsc --version
Version 2.6.2
```

Thanks in advance

Reproduce the report in the example/basicApp project by adding the shown destroy() method to src/app/Dialog.ts and running tsc with TypeScript 2.6.2. Read the Dialog class typings and its inherited-class definitions to determine whether the base-class call is represented; done means the example type-checks or the supported alternative is documented.

Written by the indexing model from the issue text.