Add a script to build and install Node.js on one of our servers

This should be part of the Puppet config eventually, but I'm not sure how to do
it.

(imported from commit 23063e1e492f6e1cad0afbcf4adffbb6e25aedf7)

servers/install-nodejs

@@ -0,0 +1,20 @@
+#!/bin/sh -e
+
+# Build Node.js from source on one of our servers.
+
+if [ $(whoami) != root ]; then
+    echo 'Run this script as root.'
+    exit 1
+fi
+
+# Print commands as we run them.
+set -x
+
+cd /root
+
+git clone https://github.com/joyent/node.git
+cd node
+git checkout v0.10.2
+./configure
+nice make
+make install