Set the users when creating group

src/views/users.html

@@ -176,6 +176,12 @@
                         </div>
                         <input type="text" class="form-control" ng-model="groupAdd.name" id="groupAddName" name="name" ng-maxlength="200" ng-minlength="1" required autofocus>
                     </div>
+                    <div class="form-group">
+                        <label class="control-label">Users</label>
+                        <div class="control-label">
+                            <multiselect ng-model="groupAdd.selectedUsers" options="(user.username || user.email) for user in users" data-compare-by="email" data-multiple="true"></multiselect>
+                        </div>
+                    </div>
                     <input class="hide" type="submit" ng-disabled="groupAddForm.$invalid || groupAdd.busy"/>
                 </form>
             </div>