scale service - respect new weight scale option for axes ordering

docs/axes/README.md

@@ -18,6 +18,7 @@ The following properties are common to all axes provided by Chart.js
 | ---- | ---- | ------- | -----------
 | `display` | `Boolean` | `true` | If set to `false` the axis is hidden from view. Overrides *gridLines.display*, *scaleLabel.display*, and *ticks.display*.
 | `callbacks` | `Object` | | Callback functions to hook into the axis lifecycle. [more...](#callbacks)
+| `weight` | `Number` | `0` | The weight used to sort the axis. Higher weights are further away from the chart area.
 
 ## Callbacks
 There are a number of config callbacks that can be used to change parameters in the scale at different points in the update process.

src/core/core.scaleService.js

@@ -36,6 +36,7 @@ module.exports = function(Chart) {
 				// Set ILayoutItem parameters for backwards compatibility
 				scale.fullWidth = scale.options.fullWidth;
 				scale.position = scale.options.position;
+				scale.weight = scale.options.weight;
 				Chart.layoutService.addBox(chart, scale);
 			});
 		}