heroku/heroku — pull request #208 by jonah-carbonfive (2012-01-12 01:31:35+00:00)
Title: Resolve issue 207: credentials via env vars

Allow user to specify HEROKU_USERNAME and HEROKU_PASSWORD environment variables to override use of credentials file.

I spec'ed out behavior for handling `reauthenticate` when credentials have been set via environment variables and for handling only one of the username/password pair being set. I'd appreciate feedback on if you all think these cases are being handled correctly and consistently with the rest of the gem.