Helper mixin for source-ordering. Expects a fraction as a value.

mixin-move

@mixin move($fraction, $persistent: false)
{
	position: relative;
	left: fraction-to-percentage($fraction);

	@if $persistent and $column-breakpoint {
		@include breakpoint( $column-breakpoint ) {
			position: static;
			position: initial;
		}
	}
}