Having an ng-view outside of ng-app should show a warning #40

This is something that a friend of mine who is new to Angular got tripped up on for some time. I think it would be pretty easy to prevent this.

<html>
  <head ng-app>
  </head>
  <body ng-view>
  </body>
</html>

The ng-view could have a yellow background to indicate that the view is not inside the app.

Since you can bootstrap your app from JavaScript, it shouldn't show a warning on the following:

<html>
  <head>
  </head>
  <body ng-view>
  </body>
</html>

Because in that case, you don't have an ngApp on the page.

This might also go well with a warning when using two ngApp directives on the same page, since you cannot bootstrap Angular from the html if you have two ngApp directives on the same page (however, I don't know if this is something that is planned to change).

Just thought I would share. Thanks for the plugin!