Use resolveOther to resolve template modules.

Since the latest version or `grunt-ember-templates` (0.4.15) creates AMD packages instead of using the Ember.TEMPLATES global the old `resolveTemplate` function would always return `undefined` since `Ember.TEMPLATES` is empty.

I found this while debugging https://github.com/stefanpenner/ember-app-kit/issues/191.  This does not fix the issue I had in there, but I *think* this change is needed regardless.