Implement weather in a international way

[raphaelm]

There are good weather APIs for the whole world out there, so there is no reason to only accept US zip codes ;)

[alexbate]

The current feed used to get the weather is capable of taking in a nearest town or city instead of a US zipcode. I've edited populate.py to prompt the user to do this and verify that you get a place with actual weather, just about to test it.