Enable workspace zoom in ardublockly front end.

ardublockly/ardublockly_blockly.js

@@ -53,12 +53,24 @@ Ardublockly.injectBlockly = function(blocklyEl, toolboxPath, blocklyPath) {
       Ardublockly.workspace = Blockly.inject(blocklyEl, {
           collapse: true,
           comments: true,
+          css: true,
           disable: true,
+          grid: false,
           media: blocklyPath + '/media/',
           rtl: false,
           scrollbars: true,
+          sounds: true,
           toolbox: xmlTree,
-            trashcan: true });
+          trashcan: true,
+          zoom: {
+            enabled: true,
+            controls: true,
+            wheel: false,
+            startScale: 1.0,
+            maxScale: 3,
+            minScale: 0.3
+          }
+      });
       Ardublockly.BLOCKLY_INJECTED_ = true;
       Ardublockly.loadSessionStorageBlocks();
     }