parameter to turn off progress bar in Census data collection step

[csfowler]

The new version of wru has a progress bar for use with collection of census data. I am running the analysis in batch mode on our computing cluster and the log files have gone from 15 KB to 100s of MB because it is recording "Progress: 100%\n" 10's of 1000's of times. I don't want to shut off the messaging completely because some of what it is reporting is useful, but the bloat from the progress bar seems like an easy fix to remove.

[1beb]

This would require a change to the function signature for predict_race, which I'm very hesitant to do this close to an election. We will add it to the list for the next version. Will leave this open. Thank you for reporting.