Create Title provider

[gjuchault]

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• I'm submitting a ...
• bug report
• feature request
• support request => Please do not submit support request here, see note at the top of this template.
• What modules are related to this pull-request
• express-engine
• grunt-prerender
• gulp-prerender
• hapi-engine
• universal-preview
• universal
• webpack-prerender
• What is the current behavior?

Error when using Title provider
EXCEPTION: No provider for Title!

• If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem by creating a github repo.

app.component.ts

export class AppComponent {
  constructor(private title: Title) {
    title.setTitle('Foobar');
  }
}```

main.node.ts
```ts
import {
    ...
    Title
} from 'angular2-universal';

export function ngApp(req: Request, res: Response): void {
  // ...
  const config: BootloaderConfig = {
    ...
    providers: [
      ...
      Title,

main.browser.ts

import { Title } from '@angular/platform-browser';

bootstrap(AppComponent, [
    ...
    Title
]);

• What is the expected behavior?

No errors, the file should get its <title> tag replaced

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

SEO

• Please tell us about your environment:
• Angular version: 2.0.0-RC.4
• Browser: all
• Language: all
• OS: all
• Platform: NodeJS
• Other information (e.g. detailed explanation, stacktraces, related issues, suggestions how to fix, links for us to have context, eg. stackoverflow, gitter, etc)

[gjuchault]

Already in #309

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