`new` command parameters should have better defaults

Currently to create a new project, we do:

```
ng new PROJECT_NAME --blueprint=ng2 --skip-bower
```

It would be great if the `--blueprint=ng2 --skip-bower` part can be omitted.

To do this, we'll need to overwrite [ember-cli's `new` command](https://github.com/ember-cli/ember-cli/blob/master/lib/commands/new.js), providing our own defaults.
Let's do this in the ng2 addon of angualr-cli.
