Add test for column ordering.
Add test for column ordering.

AtwooTM/Deedle,BlueMountainCapital/Deedle,caioproiete/Deedle,Dependencies/Deedle,caioproiete/Deedle,tpetricek/Deedle,caioproiete/Deedle,BlueMountainCapital/Deedle,Dependencies/Deedle,tpetricek/Deedle,tpetricek/Deedle,AtwooTM/Deedle,Dependencies/Deedle,AtwooTM/Deedle,BlueMountainCapital/Deedle