Work on composer, early implementation of replying

ember/app/mixins/add-css-class-to-body.js

@@ -0,0 +1,16 @@
+import Ember from 'ember';
+
+export default Ember.Mixin.create({
+  activate: function() {
+    var cssClass = this.toCssClass();
+    Ember.$('body').addClass(cssClass);
+  },
+
+  deactivate: function() {
+    Ember.$('body').removeClass(this.toCssClass());
+  },
+
+  toCssClass: function() {
+    return this.routeName.replace(/\./g, '-').dasherize();
+  }
+});