FEATURE REQUEST: Column/Vertical Helpers

[DannyLingard]

Is it possible to add helper classes to allow the .container-fluid to be more powerful. Currently, .container-fluid isn't display flex and the .row class is less than ideal in some situations due to the negative margins causing overflow.

Ideally, .flex (direction: row, flex: 0 0 0, width 100%) and .flex-column (direction: column, flex: 0 0 0, width 100%) modifier classes would allow the use of existing classes to capture most layout needs.