FEATURE: Can edit category/host relationships for embedding

app/assets/javascripts/admin/controllers/admin-embedding.js.es6

@@ -0,0 +1,18 @@
+export default Ember.Controller.extend({
+  embedding: null,
+
+  actions: {
+    saveChanges() {
+      this.get('embedding').update({});
+    },
+
+    addHost() {
+      const host = this.store.createRecord('embeddable-host');
+      this.get('embedding.embeddable_hosts').pushObject(host);
+    },
+
+    deleteHost(host) {
+      this.get('embedding.embeddable_hosts').removeObject(host);
+    }
+  }
+});