Add UK countries as dependent territories in inclusion rules

[axelboc]

Fix #361

[aplaice]

This looks great!

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I'm not quite sure whether the constituent countries of the UK strictly count as dependent territories. Unlike in the case of the constituent countries of the Kingdoms of the Netherlands or of Denmark, they're not partially independent states, that mostly just share foreign policy/defence. Scotland, Wales and N. Ireland are probably closer to autonomous regions, while England doesn't even have a parliament of its own.

However, given that people generally consider these subdivisions as "important" (more so than, say the Lands of Germany etc.), that the four territories have their own "national" sports teams and that'd it be a shame to remove them, I think that it makes sense to include them under the "dependent territories" umbrella. (Creating a separate category just for the four would feel a bit silly.) Hence, I think that the change is perfect! :)

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