* deps: upgrade TimePicker
* deps: upgrade DatePicker
* deps: upgrade Calendar
* fix: moment should work with LocaleProvider
* feat: update API of TimePicker
* feat: update Calendar's APIs
* feat: update DatePicker's APIs
* doc: update demo
* revert: add dateString and timeString and so on
* feat: add Calendar[defaultValue]
* feat: add defaultPickerValue
* docs: update docs about date picker
* feat: set moment locale to zh-cn automatically
Use ES7 style class members for event handlers so that 'this' is
automatically bound and each definition site doesn't need to manually
invoke 'bind'.
This makes all existing ES2015 class usages in components use the
same mechanism for binding.