Preserve gcxs compression #601
                
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This PR closes #596 in a fairly simple way: if all of the inputs are GCXS arrays and they have the same compression, it will return the output with the same compression. I just do this by storing a
kwargsdictionary during the_Elemwiseinitialization.A further enhancement that I'm exploring: if the
ufunchas a single input, we could avoid the conversion toCOOentirely, as well as skip some other checks. In this case we know that our argument is sparse (or we wouldn't be creating this class) and we know that it "broadcasts" to the same shape. The things to consider are the potential keywords for the ufunc:where,out, etc.