I am trying to rebase my PR and get it all up to date.

I am having trouble running the system tests. Usually I do:

pip install -e . 

To install the package locally in 'editable' mode. However, that's only installing logging and pubsub (those marked as namespaced_packages in `setup.py) into my virtualenv. So when I run the system tests, it can't import bigquery.

Not sure if the repo needs to be fixed or my workflow do, still wrapping my head around how the namespaced pacakges are supposed to work. Is there a reason it's only logging and pubsub in there currently?