Implement Amazon AWS auto-deployment

 * Prerequisites for Windows

   - Install cygwin with rsync and OpenSSH packages.

 * Prerequisite for KAIST users

   - Increase the sleep time between SSH connection tests in ~/.vagrant.d/gems/gems/vagrant-aws-0.x.x/lib/vagrant-aws/action/(run|start)_instance.rb larger than 10 seconds to avoid blocking by IDS/firewall.