extract the grid to its own class

js/html_actuator.js

@@ -2,9 +2,9 @@ function HTMLActuator() {
 
 }
 
-HTMLActuator.prototype.update = function (grid) {
+HTMLActuator.prototype.actuate = function (grid) {
   // Temporary debug visualizer
-  grid.forEach(function (row) {
+  grid.cells.forEach(function (row) {
     var mapped = row.map(function (tile) {
       return tile ? tile.value : " ";
     }).join(" | ");