Produce .d.ts files from our typescript compilation.

Deliver them into our npm module output so users can consume them directly.

Fixes #3082

modules/angular2/src/core/di/binding.ts

@@ -30,9 +30,6 @@ import {
 } from './exceptions';
 import {resolveForwardRef} from './forward_ref';
 
-/**
- * @internal
- */
 export class Dependency {
   constructor(public key: Key, public optional: boolean, public lowerBoundVisibility: any,
               public upperBoundVisibility: any, public properties: any[]) {}
@@ -280,7 +277,6 @@ export class ResolvedBinding_ implements ResolvedBinding {
 }
 
 /**
- * @internal
  * An internal resolved representation of a factory function created by resolving {@link Binding}.
  */
 export class ResolvedFactory {

modules/angular2/src/core/di/injector.ts

@@ -387,7 +387,6 @@ export class BindingWithVisibility {
 }
 
 /**
- * @internal
  * Used to provide dependencies that cannot be easily expressed as bindings.
  */
 export interface DependencyProvider {

modules/angular2/src/core/di/type_literal.ts

@@ -1,5 +1,4 @@
 /**
- * @internal
  * Type literals is a Dart-only feature. This is here only so we can x-compile
  * to multiple languages.
  */