// Coluna do grid
/// 
/// @param {number} $columns
/// @param {number} $push
/// @param {string} $fold [left]
///
@mixin x-column($columns:$columns, $push:$push, $fold:left) {
	display: inline;
	float: $fold;
	width: x-gridsystem-width($columns);
	padding-left: $padding-width;
  padding-right: $padding-width;
  
  @if $fold == left {
    margin-left:x-gridsystem-width($push);
  }
  @if $fold == right {
    margin-right:x-gridsystem-width($push);
  }
}