Finite difference branch (Calculus.jl replacement) #10
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While the code is far from perfect (does not handle complex-valued functions, could use refactoring to get rid of some redundant code where possible, etc.), I think it's a functionally complete Calculus.jl replacement that vastly outdoes it in performance (particularly for DiffEq wrapper types). Accordingly, I think it might be ready for a first release unless you see anything you don't like.