Enumerable#except #133

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@burke

I realize there are plenty of good reasons not to further pollute Enumerable, but I get a lot of use out of this method, and I think other people would find it handy as well.

@tenderlove
Ruby on Rails member
irb(main):001:0> [1,2,3,4,5] - [2,4]
=> [1, 3, 5]
irb(main):002:0> 
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