Naming of direction

[casamia918]

In layout system, de facto standard naming rule of "horizontal" and "vertical" is related by the affected Elements placement.

Which is

A-B-C : This is horizontal

A | B | C : This is Vertical

But this library uses inversed naming rule of horizontal and vertical.

If you are considered about the version compatiability, I think it'd be better to create new prop (named orientation or direction)

By the way, I like this library. Well maded. Thanks.