Generate navigation for data structures

On generation of the scaffold with an initial model:

    ember generate --scaffold person name:string age:number

add a link to `#people` to the index.html:

    <nav>
      <ul>
        <li>{{#linkTo "index"}}Home{{/linkTo}}</li>
      </ul>
    </nav>

like so:

    <nav>
      <ul>
        <li>{{#linkTo "index"}}Home{{/linkTo}}</li>
        <li>{{#linkTo "people"}}People{{/linkTo}}</li>
      </ul>
    </nav>

instead of the comment the README.md:

    # visit #/people