default motion for datepicker

components/datepicker/demo/transitionName.md

-# 基本
-
-- order: 0
-
-启用动画。
-
----
-
-````jsx
-var Datepicker = antd.Datepicker;
-
-React.render(
-  <Datepicker
-  transitionName="slide-up"
-  value="" />
-, document.getElementById('components-datepicker-demo-transitionname'));
-````

components/datepicker/index.jsx

@@ -43,8 +43,8 @@ export default React.createClass({
     return {
       format: 'yyyy-MM-dd',
       placeholder: '请选择日期',
-      onSelect: function () {
-      }
+      transitionName: 'slide-up',
+      onSelect: function () {}
     };
   },
   handleChange(v) {