Modify Rectangle.fromCartographicArray to support rectangles that cross the IDL

[hpinkos]

Fixes #3227

[hpinkos]

Here's the sandcastle example I was testing with:

var viewer = new Cesium.Viewer('cesiumContainer');

var cartos = [Cesium.Cartographic.fromDegrees(-179, -4),
              Cesium.Cartographic.fromDegrees(1, 4)];
var points = viewer.scene.globe.ellipsoid.cartographicArrayToCartesianArray(cartos);

for (var i = 0; i < points.length; i++) {
    viewer.entities.add({
        position : points[i],
        point : {
            pixelSize : 10,
            color : Cesium.Color.YELLOW
        }
    });
}

var rectangle = Cesium.Rectangle.fromCartographicArray(cartos);
var redRectangle = viewer.entities.add({
    rectangle : {
        coordinates : rectangle,
        material : Cesium.Color.RED.withAlpha(0.5),
        outline : true,
        outlineColor : Cesium.Color.RED
    }
});

viewer.entities.add({
    polyline: {
        positions: Cesium.Cartesian3.fromDegreesArray([180, -80, 180, 80])
    }
});

[pjcozzi]

Thanks @hpinkos! Update CHANGES.md.

@bagnell can you review this one too?