Remove indentation for Gumby Fancy Tiles

A great feature of the Gumby Framework is its ability to easilycreate responsive tiles. They call those Fancy Tiles. For example you can use the following mixin to create a equally distributed grid with 5 columns on a desktop, 3 on a tablet and 2 on a mobile screen.

ul.fancy { 
  @include fancytiles (5,3,2);

What kept bugging me with that is that each tile gets a padding on both its left and the right side. This makes the entire Fancy Tiles show up indented compared to the columns of Gumby's regular grid system.