Add simple English-language string manipulation functions (e.g., PluralWord) about go-humanize HOT 5 CLOSED

Hmm... WordSeries seems to already be starting an Oxford comma debate. :)

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I'm happy to add OxfordWordSeries as well. ;-)

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@shurcooL Do you have any objections here? I want the Oxford comma, but it seems like a generally useful thing when dealing with sets.

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I'm always cautious about expanding the surface area of an API and increasing scope of a library. The addition should be justified.

But, I don't have strong objections.

If the implementation is not so trivial that anyone can implement it trivially in their project, and if you think this is going to be used by enough people, then humanize will become better if this is added.

I don't have a need for this at this time, so it's hard for me to say whether it's useful.

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Also, since @clconway offered kindly not only to contribute, but also to maintain these, that makes it easier to say yes.

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