Merge pull request #1531 from AnalyticalGraphicsInc/fix-sandcastle-te…

…rrain

Fix terrain sandcastle example

Apps/Sandcastle/gallery/Terrain.html

@@ -109,7 +109,7 @@
 
                 Cesium.when(Cesium.loadImage('../images/facility.gif'), function(image) {
                     var textureAtlas = scene.context.createTextureAtlas({images : [image]});
-                    billboards.setTextureAtlas(textureAtlas);
+                    billboards.textureAtlas = textureAtlas;
                 });
             } else {
                 billboards.removeAll();