Add script/bootstrap

http://wynnnetherland.com/linked/2013012801/bootstrapping-consistency

script/bootstrap

@@ -0,0 +1,10 @@
+#!/usr/bin/env bash
+set -e
+
+npm install
+
+if phantom_version="$(phantomjs --version)"; then
+  echo "phantomjs ${phantom_version}"
+else
+  echo "You should install PhantomJS for \`script/test' to work." >&2
+fi