Hey Rahul, is your 'ee' still working fine for you? I've just tried it on two separate droplets, and it's not finishing up site creation for me. The first two lines of your code work fine and unpack well, except for one error I caught:
Updating PHP Configuration Files...
Restarting PHP5-FPM Configuration, Please Wait...
php5-fpm stop/waiting php5-fpm start/running, process 8328
WP Command Not Found !
Installing WP-CLI, Please Wait...
After this, it finishes and then when I call out your third line in 'ee', it doesn't do anything. Nada. Any ideas about what's goin on?