Support direction switch on breakpoint

[jochienabuurs]

It would be nice if there would be a feature to change the flex-direction per breakpoint for rows to column or column-reverse. This would allow for stacking of columns on mobile and change to regular grid on tablet or desktop.

[jacargentina]

@jochienabuurs Please go to https://jacargentina.github.io/react-flexbox-grid/ and open an issue but with more detail, as your request is not giving much details on the idea. Maybe a full example and the desired behaviour?