code: function fillImpliedPositions(colorStops) {
  		var from = 0;
  		
  		_.each(colorStops, function(cs, i) {
  			// make sure that first and last positions are defined
  			if (!i)
  				return cs.position = cs.position || 0;
  			
  			if (i == colorStops.length - 1 && !('position' in cs))
  				cs.position = 1;
  			
  			if ('position' in cs) {
  				var start = colorStops[from].position || 0;
  				var step = (cs.position - start) / (i - from);
  				_.each(colorStops.slice(from, i), function(cs2, j) {
  					cs2.position = start + step * j;
  				});
  				
  				from = i;
  			}
  		});
  	}
docs: Fills-out implied positions in color-stops. This function is useful for
  old Webkit gradient definitions