add script to create an initial admin user

script/make_user.rb

@@ -0,0 +1,9 @@
+#!/usr/bin/env ruby
+trap("INT") { puts ; exit }
+
+require_relative '../config/environment'
+require 'postal/user_creator'
+
+Postal::UserCreator.start do |u|
+  u.admin = true
+end