Change models, new migrations, fix front and make tests work

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

js/src/components/Group/Create.vue

@@ -98,7 +98,7 @@
           .then(response => response.json())
           .then((data) => {
             this.loading = false;
-            this.categories = data['hydra:member'];
+            this.categories = data;
           });
       },
       getAddressData: function (addressData) {

js/src/components/Group/GroupList.vue

@@ -58,7 +58,7 @@
           .then(response => response.json())
           .then((data) => {
             this.loading = false;
-            this.groups = data['hydra:member'];
+            this.groups = data;
           });
       },
       deleteEvent(id) {