Merge branch 'master' into feat-focus

diff --cc src/TimePicker.jsx
index 01bab2c5b5185e33ba0431ac200da40c441725ab,da47ac4d9c211192c985f6dbc0d9c88ae60feb8a..aa3e0da726f009c6e54b69696945b8b382048765
--- 1/src/TimePicker.jsx
--- 2/src/TimePicker.jsx
+++ b/src/TimePicker.jsx
@@@ -183,10 -185,6 +185,10 @@@ const Picker = React.createClass(
      }
    },
  
-     this.refs.picker.focus();
 +  focus() {
++    this.picker.focus();
 +  },
 +
    render() {
      const {
        prefixCls, placeholder, placement, align,