Feature/scaffold ngapp using `yo angular`

Rebuild the Angular SPA using `yo angular`.

**TODO**

 - [x] integration of `ngapp` into the server (webapp)
 - [x] `grunt serve` should start the full-stack app, not grunt-connect
 - [x] add css to `ngapp` - copy, move or share
 - [x] remove the html5 folder

/to @ritch please review. You can look at the work I made so far or wait until the PR is done (hopefully tomorrow).
The build output is in `ngapp/dist/index.html`, you have to run `grunt build`.

In the development mode, `index.html` is served as-is.