gistfile1.js

var Session = Ember.Object.extend({isAuthenticated:true});

export default {
	name: 'session',

	initialize: function(container, application) {
    	application.register('service:session', Session);

    	application.inject('controller', 'session', 'service:session');
  	}
};

In Ember-cli generated project
initializers/session.js