Returns string representation of parsed gradient
@param {Object} gradient Parsed gradient
@param {String} prefix Vendor prefix
@returns {String}
function(gradient, prefix) {
			if (gradient.type == 'linear') {
				var fn = (prefix ? '-' + prefix + '-' : '') + 'linear-gradient';
				
				// transform color-stops
				var colorStops = _.map(gradient.colorStops, function(cs) {
					return cs.color + ('position' in cs 
							? ' ' + cs.position + (cs.unit || '')
							: '');
				});
				
				if (gradient.direction 
						&& (!prefs.get('css.gradient.omitDefaultDirection') 
						|| !_.include(defaultLinearDirections, gradient.direction))) {
					colorStops.unshift(gradient.direction);
				}
				
				return fn + '(' + colorStops.join(', ') + ')';
			}
		}