Merge pull request xgfe#204 from believeZJP/patch-1

fix when mode === 'time', androidMode  not works~

Author: feyy

datepicker.js

@@ -277,7 +277,8 @@ class DatePicker extends Component {
         TimePickerAndroid.open({
           hour: timeMoment.hour(),
           minute: timeMoment.minutes(),
-          is24Hour: is24Hour
+          is24Hour: is24Hour,
+          mode: androidMode
         }).then(this.onTimePicked);
       } else if (mode === 'datetime') {
         // 选日期和时间