Use the npm closure library instead of the same library installed at a parallel directory

build.py

@@ -85,7 +85,7 @@ var isNodeJS = !!(typeof module !== 'undefined' && module.exports &&
 
 if (isNodeJS) {
   var window = {};
-  require('../closure-library/closure/goog/bootstrap/nodejs');
+  require('closure-library');
 }
 
 window.BLOCKLY_DIR = (function() {
@@ -107,7 +107,7 @@ window.BLOCKLY_DIR = (function() {
 window.BLOCKLY_BOOT = function() {
   var dir = '';
   if (isNodeJS) {
-    require('../closure-library/closure/goog/bootstrap/nodejs');
+    require('closure-library');
     dir = 'blockly';
   } else {
     // Execute after Closure has loaded.

package.json

@@ -28,5 +28,8 @@
     "sub": true,
     "undef": true,
     "unused": true
+  },
+  "dependencies": {
+    "closure-library": "^1.43629075.2"
   }
 }