Column padding for fixed column vs auto

Created by: gregschmit

I noticed that when using col-md-3 and col-md-auto together, that col-md-3 gets 15px padding, but col-md-auto does not. I am a new contributor so forgive me if this has been addressed already (although I did search for issues relating to this).

The issue is that in bootstrap-grid.css, col-md-auto is only mentioned once to make it a flexbox and set width: auto;. There are four responsive blocks that contain all columns (in all of their responsive forms) that apply padding-left: 15px; and padding-right: 15px;.

This seems to me to be a bug, not a feature. Should this be fixed?

P.S. I am more than happy to make the change and submit a pull request, but for a big project like this I presume the development team doesn't operate like that.