Simple git client for R based on 'libgit2' with support for SSH and
HTTPS remotes. All functions in 'gert' use basic R data types (such as
vectors and data-frames) for their arguments and return values. User
credentials are shared with command line 'git' through the
git-credential store and ssh keys stored on disk or ssh-agent. On
Linux, a somewhat recent version of 'libgit2' is required; we provide
a 'PPA' for older Ubuntu 'LTS' versions.