Adds basic client unit testing setup using ember-mocha.
There are many example blueprints for unit tests using ember-cli-mocha here. These are written for Ember CLI, but apply nearly the same here.
My hope is that this is just the beginning of many unit tests for the admin client.
Navigating to http://localhost:7357/core/test/client/index.html then shows the browser tests:
p.s. Sorry it took me so long...