Setup and retrieve HTTPS and SSH credentials for use with 'git' and
other services. For HTTPS remotes the package interfaces the
'git-credential' utility which 'git' uses to store HTTP usernames and
passwords. For SSH remotes we provide convenient functions to find or
generate appropriate SSH keys. The package both helps the user to
setup a local git installation, and also provides a back-end for
git/ssh client libraries to authenticate with existing user
credentials.