Allow Custom Variable or Namespace for Ember.Application.create()

[RunnerRick]

While App is the usual name used for the Ember.Application instance, it would be nice if the developer could specify a different name and/or namespace for the Ember.Application.

Usage could be something like ...

ember create --ns MyApp
ember create --ns MyNamespace.MyApp

[ryanflorence]

yeah, this has always been in the back of my head, to implement

1. provide option to create
2. save option to ember.json
3. pass that to the templates