[FIX] tour.js: introduce common properties selector

Since jquery 1.9, attr selector only matches attributes (the behavior was not
consistent before, sometimes it returned the properties [0]) and tour.js was
relying on those inconsistencies. This commit introduce common properties
selector to allow matching properties during a tour.

[0] http://jquery.com/upgrade-guide/1.9/#attr-versus-prop-

addons/web/static/src/js/tour.js

@@ -41,7 +41,16 @@ $.extend($.expr[':'],{
         var regreg =  /^\/((?:\\\/|[^\/])+)\/([mig]{0,3})$/,
         reg = regreg.exec(m[3]);
         return reg ? new RegExp(reg[1], reg[2]).test($.trim(a.innerHTML)) : false;
-    }
+    },
+    propChecked: function(element, index, matches) {
+        return $(element).prop("checked") === true;
+    },
+    propSelected: function(element, index, matches) {
+        return $(element).prop("selected") === true;
+    },
+    propValue: function(element, index, matches) {
+        return $(element).prop("value") === matches[3];
+    },
 });
 $.ajaxSetup({
     beforeSend:function(){