Ship the custom node binary build with atom-shell.

This is required by the child_process.fork, which is indeed executing
the node binary to start a script.

The node fork can be found at:
https://github.com/atom/cefode-node/tree/chromium-v8

atom.gyp

@@ -157,7 +157,14 @@
               'files': [
                 'browser/default_app',
               ],
-            }
+            },
+            {
+              # Copy node binary for worker process support.
+              'destination': '<(PRODUCT_DIR)/<(product_name).app/Contents/Resources',
+              'files': [
+                'node/node',
+              ],
+            },
           ],
           'postbuilds': [
             {