add spinner to search field in multiselect. fixes #130

select2.css

@@ -382,6 +382,9 @@ disabled look for already selected choices in the results dropdown
   box-shadow        : none;
 }
 
+.select2-container-multi .select2-choices .select2-search-field input.select2-active {
+    background: #fff url('spinner.gif') no-repeat 100% !important;
+}
 
 .select2-default {
   color: #999 !important;