allow getting urls for multiple/all cities

Merhaba Direnkod!

Thanks for making this script. My co-worker Destine sent it to me - I'm interested in trying to do some fraud analysis on the election data.

I've just added a couple of things which should give you a hint about what my computer is currently doing: now you can call the script which fetches all the box urls with multiple city names separated by ",", or you can pass the argument "--all" to get all the cities.

Hopefully you don't mind me digging around in your code - if not, I'll send more pull requests if you'd like. Thanks again.

-Dan