标准化 button, boxgroup

https://github.com/ecomfe/ub-ria-ui/issues/1
https://github.com/ecomfe/ub-ria-ui/issues/2
https://github.com/ecomfe/ub-ria-ui/issues/3
https://github.com/ecomfe/ub-ria-ui/issues/4
https://github.com/ecomfe/ub-ria-ui/issues/5
https://github.com/ecomfe/ub-ria-ui/issues/6
https://github.com/ecomfe/ub-ria-ui/issues/7