FIX: Group pages should work when group name contains periods.

https://meta.discourse.org/t/group-name-cant-have-dot-inside/48658

test/javascripts/acceptance/group-manage-logs-test.js.es6

@@ -11,7 +11,7 @@ acceptance("Group logs", {
       ];
     };
 
-    server.get('/groups/snorlax', () => { // eslint-disable-line no-undef
+    server.get('/groups/snorlax.json', () => { // eslint-disable-line no-undef
       return response({"group":{"id":41,"automatic":false,"name":"snorlax","user_count":1,"alias_level":0,"visible":true,"automatic_membership_email_domains":"","automatic_membership_retroactive":false,"primary_group":true,"title":"Team Snorlax","grant_trust_level":null,"incoming_email":null,"has_messages":false,"flair_url":"","flair_bg_color":"","flair_color":"","bio_raw":"","bio_cooked":null,"public":true,"is_group_user":true,"is_group_owner":true}});
     });
 

test/javascripts/fixtures/group-fixtures.js.es6

@@ -1,5 +1,5 @@
 export default {
-  "/groups/moderators":{
+  "/groups/moderators.json":{
     "group": {
       "id": 50,
       "automatic": true,
@@ -32,7 +32,7 @@ export default {
       "messageable": true
     },
   },
-  "/groups/discourse":{
+  "/groups/discourse.json":{
     "group":{
       "id":47,
       "automatic":false,