err 1.7.1 fails to install unless xmpppy 0.5.0rc1 is installed

The cookbook in its default state is broken due to err 1.71, which depends on xmppy, however without forcing 0.5.0rc1, the pip install fails.. While this is sort of a hack since there are newer versions of err, the 2.x.x also fail. See: https://github.com/gbin/err/issues/179