fix datepicker to use change not blur

to fix safari double send

Author: Dave Conway-Jones

src/components/ui-component/templates/date-picker.html

@@ -16,7 +16,7 @@
             md-placeholder="{{me.item.getLabel()}}"
             md-open-on-focus
             ng-model="me.item.ddd"
-            ng-blur="me.setDate()">
+            ng-change="me.setDate()">
         </md-datepicker>
     </md-input-container>
 </md-card>