fire change on clear. fixes select2#558

Author: ivaynberg

select2.js

@@ -1742,6 +1742,7 @@ the specific language governing permissions and limitations under the Apache Lic
             this.setPlaceholder();
 
             this.opts.element.trigger({ type: "removed", val: this.id(data), choice: data });
+            this.triggerChange({removed:data});
         },
 
         /**
@@ -2352,7 +2353,6 @@ the specific language governing permissions and limitations under the Apache Lic
             selected.remove();
 
             this.opts.element.trigger({ type: "removed", val: this.id(data), choice: data });
-
             this.triggerChange({ removed: data });
         },