Customize [downloads] shortcode columns of 0

The downloads shortcode spits out div's with clear:both in order to force columns, but if one could make a column of 0 (zero) without them, it would permit CSS styling for a far easier responsive display.
Merge branch 'patch-1' of https://github.com/Ipstenu/Easy-Digital-Downloads into Ipstenu-patch-1
Check for 0 first
Merge branch 'master' of github.com:easydigitaldownloads/Easy-Digital-Downloads