Use textsecure.messaging to create groups

Not textsecure.storage. Sigh. Also accomodate the fact that
the group id is not returned directly, but rather at the end
of a promise chain.

js/models/threads.js

@@ -36,7 +36,7 @@ var Whisper = Whisper || {};
         var promise = textsecure.messaging.sendMessageToNumber(this.get('id'), message, []);
       }
       else {
-        var promise = textsecure.messaging.sendMessageToGroup(this.get('id'), message, []);
+        var promise = textsecure.messaging.sendMessageToGroup(this.get('groupId'), message, []);
       }
       promise.then(
         function(result) {
@@ -68,15 +68,18 @@ var Whisper = Whisper || {};
     },
 
     createGroup: function(recipients, name) {
-      var group = textsecure.storage.groups.createNewGroup(recipients);
       var attributes = {};
       attributes = {
-        id        : group.id,
         name      : name,
-        numbers   : group.numbers,
+        numbers   : recipients,
         type      : 'group',
       };
-      return this.findOrCreate(attributes);
+      var thread = this.findOrCreate(attributes);
+      return textsecure.messaging.createGroup(recipients, name).then(function(groupId) {
+        thread.set('groupId', groupId);
+        thread.save();
+        return thread;
+      });
     },
 
     findOrCreateForRecipient: function(recipient) {

js/views/new_group_view.js

@@ -36,10 +36,12 @@ var Whisper = Whisper || {};
       e.preventDefault();
       var numbers = this.$el.find('input.numbers').val().split(',');
       var name = this.$el.find('input.name').val();
-      var thread = Whisper.Threads.createGroup(numbers, name);
-      thread.sendMessage(this.$el.find('input.send-message').val());
-      this.remove();
-      thread.trigger('render');
+      var view = this;
+      Whisper.Threads.createGroup(numbers, name).then(function(thread){
+        thread.sendMessage(view.$el.find('input.send-message').val());
+        view.remove();
+        thread.trigger('render');
+      });
     },
 
     render: function() {