Some fixes about the infinite scroll.

see #585

modoboa/static/js/jquery.infinitescroll.js

@@ -44,7 +44,7 @@
                     $this.$options.process_results(data);
                     if (data.length === 0) {
                         $this.end_of_results = true;
-                        /*$this.$element.find('#end-of-results').removeClass('hide');*/
+                        $this.$options.end_of_list_reached($this.$element);
                     }
                     //$this.$element.find('.spinner').addClass('hide');
                     $this.executing = false;

modoboa/static/js/notify.js

@@ -11,7 +11,7 @@
             if (bid === undefined) {
                 bid = "notifybox";
             }
-            var div = $("<div class='alert' />", {
+            var div = $("<div class='alert alert-dismissible' role='alert' />", {
                 id: bid,
                 click: $.proxy(this.destroy_box, this)
             }).css({