Warning: Permanently added 'github.com,192.30.252.120' <RSA> to the list of known hosts.
The answer is to create a ~/.ssh/config file and insert the line:
UserKnownHostsFile ~/.ssh/known_hosts
详见：http://stackoverflow.com/questions/9299651/git-says-warning-permanently-added-to-the-list-of-known-hosts
