fix(typings): typings template should make module name at end of file dynamic

[jeffbcross]

This template is causing the router.d.ts output to have a redundant declaration to angular2.

declare module "angular2/angular2" {
  export ng;
}

Should be

declare module "angular2/router" {
  export = ng;
}

Template location: https://github.com/angular/angular/blob/master/docs/dgeni-package/templates/type-definition.template.html

[jeffbcross]

Also, the namespace should be dynamic, i.e. ngRouter, as described in #3458.

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