Add empty tests for adapter and serializer.

I played around with trying to get the tests working but I couldn't figure it out.  I'll add some comments inline.
I had to add this to the dummy application that is used in the tests because `moduleFor('adapter:application', ... )` and `moduleFor('serializer:application', ... )`. I don't think this is correct because the  host and namespace overrides won't be applied. As I understand the ember-cli docs, the adpater and serializer should be available for the tests without having to do something like this. @dustinfarris Do you know what's going on?