Clean up skeleton and module import stuff

This isn't for merging, just to be used as a basis for discussion. Let me know if you know of a better way.
I put this file here just to check it in, but it is a proposed format for the module manifest that `mimosa-ember-module-import` would generate (you can test it with the current skeleton by moving it to where it belongs and renaming it).

Instead of binding everything to `App` (which would mean that by the time this executes, `App` would have to already be a freshly created `Ember.Application` instance), we can set everything in a hash, making sure that the keys have names that comply with [Ember.DefaultResolver](http://emberjs.com/api/classes/Ember.DefaultResolver.html).