Changed AMD module name to be less generic

We're using a heavy fork of Ember App Kit at Pivotshare and one thing that's bugged us is that this resolver defines itself just as "resolver". What if there was another project I needed to include that did this too?

Nit picky...but trivial to change for best practice. Changed to `ember-resolver`.

If accepted, EAK and EAR should probably be updated too, which I'll happily PR for you all.

I was going to name it `ember-jj-abrams-resolver` but since the point of this is to be *the* `ember-resolver`, and is made by a core team member, I figured the shorter name was fine.