Ignore `.` in slugs
Ignore `.` in slugs

This prevents the ignored slug from gobbling up `.csv` at the end of
URLs in redirects. The slugs we've used never used `.`, so this is a
safe change.

DemocracyClub/yournextrepresentative,DemocracyClub/yournextrepresentative,DemocracyClub/yournextrepresentative