The installation instructions were incorrect; they advised the user to
install a package via pip that was not registered in pypi. This patch
changes the installation instructions to ones that work. To avoid
confusion, this patch also notes that the client does not run via a
command, but can just be imported into other scripts.
Change-Id: If34a26dc78641daf0be90dab4a7f788dc72db4bb
c0a604b432