Fix to setup.py for including pseudo-packages on install
Fix to setup.py for including pseudo-packages on install

Also fixed in the uploaded PyPI release.

mjabri/holoviews,basnijholt/holoviews,basnijholt/holoviews,ioam/holoviews,ioam/holoviews,vascotenner/holoviews,mjabri/holoviews,vascotenner/holoviews,ioam/holoviews,basnijholt/holoviews,mjabri/holoviews,vascotenner/holoviews