Add tests for Ember application

This is a work in progress for adding tests for the containing Ember application. The used test framework is [konacha](https://github.com/jfirebaugh/konacha).

Next: add more tests and figure out how to test the router. The [basic_test.js](https://github.com/emberjs/ember.js/blob/master/packages/ember/tests/routing/basic_test.js) in the ember.js repo should be a starting point.

Any ideas/suggestions?