Bundle offical node binary with Atom.

This is required for using child_process.fork.

script/update-node

@@ -0,0 +1,43 @@
+#!/bin/bash
+
+set -e
+
+cd "$(dirname $0)/.."
+
+# Test whether we need update.
+if [ -d "node/node" ]; then
+  exit 0
+fi
+
+if ! DOWNLOAD_PAGE=$(curl -fsSkL http://nodejs.org/download/); then
+  exit 1;
+fi
+
+NODE_VERSION=$(echo "$DOWNLOAD_PAGE" \
+               | awk '/Current version:/ { print }' \
+               | awk -F"[<>]" '{ print $5 }')
+
+case $OSTYPE in
+  darwin*) NODE_PLATFORM=darwin ;;
+  linux*) NODE_PLATFORM=linux ;;
+  *) echo "Unsupported platform $OSTYPE" && exit 1 ;;
+esac
+
+if uname -a | grep 'x86_64' > /dev/null ; then
+  NODE_ARCH=x64
+else
+  NODE_ARCH=x86
+fi
+
+NODE_DIST_NAME="node-$NODE_VERSION-$NODE_PLATFORM-$NODE_ARCH"
+
+# Download node and untar
+NODE_TARBALL_URL="http://nodejs.org/dist/$NODE_VERSION/$NODE_DIST_NAME.tar.gz"
+TARGET_DIR='node'
+[ -d "$TARGET_DIR" ] || mkdir "$TARGET_DIR"
+cd "$TARGET_DIR"
+curl -fsSkL $NODE_TARBALL_URL | tar -zx || exit 1
+
+cp "$NODE_DIST_NAME/bin/node" .
+rm -rf "$NODE_DIST_NAME"
+