FIX: Return all groups instead of truncated list (#42)

assets/javascripts/discourse/controllers/admin-plugins-explorer.js.es6

@@ -70,7 +70,7 @@ export default Ember.Controller.extend({
 
   @computed("groups")
   groupOptions(groups) {
-    return groups.arrangedContent.map(g => {
+    return groups.map(g => {
       return { id: g.id.toString(), name: g.name };
     });
   },

assets/javascripts/discourse/routes/admin-plugins-explorer.js.es6

@@ -4,7 +4,7 @@ export default Discourse.Route.extend({
   controllerName: "admin-plugins-explorer",
 
   model() {
-    const groupPromise = this.store.findAll("group");
+    const groupPromise = ajax("/admin/plugins/explorer/groups.json");
     const schemaPromise = ajax("/admin/plugins/explorer/schema.json", {
       cache: true
     });