apply aggregate for country #394
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Hi, sorry to disturb you.
I think Class Location is dealing with too many attributes, so I just want to put everything related to country into a class(an aggregation), like country _code and country_population, state, province and county.
I changed utils/countries.py to a class named Country, which is the aggregate root. I turned population.py into a class so that Country class has a reference to it. So, when objects outside aggregate boundary can only have a reference to the Country class.