Add fuzzy matching for country names

[andy-isoc]

Turns out heart needs the fuzzy matching so I reckon we should add it to the lib.

I noticed while doing this that the way we've structured this means you need to import regions to use any of this. I'm wondering if we should ditch the Regions class and just have everything as a top-level function? (Perhaps as a new major version of the lib as it would be a breaking change).

Also, the hdx fuzzy matching isn't very fuzzy; it just has some defined regexs for each country. I tried seeing if it would fuzzy match Amenia, and Armenib for Armenia but it wouldn't.

[garrettc]

I think moving the region stuff to top-level makes sense, and now is probably a good time to do it.

[madofo]

Can we have a dev retreat in Foobarland please?

[madofo]

On the Regions question I think removing makes sense as these functions aren't actually specific to 'regions' anyway are they?

[andy-isoc]

Can we have a dev retreat in Foobarland please?

Definitely! I hear there are some nice places to stay in the capital city, Baz