* Unify name of ReactNode type in document
* Lowser all string type name
* Lowercase all number type name
* Lowercase all boolean type name
* Unify array type
* Lowercase all object type name
* Unify mutilple types
* remove unnecessary computed props for classNames
* rollback autocomplete optimization for possible css style order issue
* update snapshots
* remove more unnecessary computed props at Input
Make Breadcrumb, Checkbox, Dropdown, Steps and Timeline
components use ES2015 classes rather than React.createClass.
This includes:
* getDefaultProps method becomes a defaultProps value on the
constructor.
* propTypes becomes a value on the constructor.