Gritter Accessibility Changes

Adding in role to the main gritter item wrapper, as well as changing the
close div to a link tag to allow it to be readable, as well as able to
be closed via keyboard

css/jquery.gritter.css

@@ -67,6 +67,7 @@
 	cursor:pointer;
 	width:30px;
 	height:30px;
+	text-indent:-9999em;
 }
 .gritter-title {
 	font-size:14px;

js/jquery.gritter.js

@@ -78,9 +78,9 @@
 		_custom_timer: 0,
 		_item_count: 0,
 		_is_setup: 0,
-		_tpl_close: '<div class="gritter-close"></div>',
+		_tpl_close: '<a class="gritter-close" href="javascript:void(0);" tabindex="1">Close Notification</a>',
 		_tpl_title: '<span class="gritter-title">[[title]]</span>',
-		_tpl_item: '<div id="gritter-item-[[number]]" class="gritter-item-wrapper [[item_class]]" style="display:none"><div class="gritter-top"></div><div class="gritter-item">[[close]][[image]]<div class="[[class_name]]">[[title]]<p>[[text]]</p></div><div style="clear:both"></div></div><div class="gritter-bottom"></div></div>',
+		_tpl_item: '<div id="gritter-item-[[number]]" class="gritter-item-wrapper [[item_class]]" style="display:none" role="alert"><div class="gritter-top"></div><div class="gritter-item">[[close]][[image]]<div class="[[class_name]]">[[title]]<p>[[text]]</p></div><div style="clear:both"></div></div><div class="gritter-bottom"></div></div>',
 		_tpl_wrap: '<div id="gritter-notice-wrapper"></div>',
 
 		/**