Listofpopularcities 79 rsid

closes issue #79 
I noticed in the db snapshot @tkwidmer sent that 'San Francisco' and 'SAN FRANCISCO' are both in the top 5 cities. Do you want to run a migration at some point to consolidate all these records to use the same city name, or would you like me to include some handling here for aggregating data for cities that are secretly the same place?