The Let's Encrypt client (letsencrypt [0]) was recently renamed to certbot and upgraded to 0.6.0. [1]
I renamed the letsencrypt package to certbot and applied the update in 9495cf9a8, keeping a letsencrypt variable that we can phase out later on. Please note that the executable's name has changed to 'certbot'. [0] https://github.com/letsencrypt/letsencrypt [1] https://pypi.python.org/pypi/certbot
