Compass.app: @include background linear-gradient

.scss {
	@include background(linear-gradient(#ffffff, #F6F6F6));
}
// becomes
.css {
	background: -webkit-linear-gradient(#ffffff, #f6f6f6);
	background: -moz-linear-gradient(#ffffff, #f6f6f6);
	background: -o-linear-gradient(#ffffff, #f6f6f6);
	background: linear-gradient(#ffffff, #f6f6f6);
}