I don't think this host hack is necessary any more since gitpan is now an organization.

Gitpan used to be its own Github user which meant its own login and
ssh key.  Now its an organization.  You can push/pull to gitpan hosts
with your normal github SSH key if you're part of the gitpan org.

It's still going to be necessary for testing with the gitpan-test-account
account.

Changed host() to remote_host() to better describe its function.