'Symlink project single version
Link from $WEB_ROOT/<project> ->
HOME/user_builds/<project>/rtd-builds/latest/'

def symlink_single_version(self):

    version = self.get_default_version()
    symlink = self.project_root
    if os.path.islink(symlink):
        os.unlink(symlink)
    if os.path.exists(symlink):
        shutil.rmtree(symlink)
    if (version is not None):
        docs_dir = os.path.join(settings.DOCROOT, self.project.slug, 'rtd-builds', version.slug)
        run(('ln    -nsf    %s/    %s' % (docs_dir, symlink)))
