RTL Support

Created by: pixxet

please give this fork a look,

https://github.com/pixxet/Bootstrap-4-RTL-Support

Its a 100% RTL support without only flipping the directions. all you need is to define $rtl: true; to make bootstrap support RTL.

directions are named to $direction_1 and $direction_2 and defined base on the value of $rtl.

default $rtl: false;

hope this helps someone, and it would be great if twbs would adapt this solution.