Updated differentiate.jl to be make finite differences based on a symbolic expression#12

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jckt wants to merge 2 commits intoJuliaMath:masterfrom jckt:master

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Commits on May 26, 2013

Added a function to allow differentiate() to make a finite difference based on a symbolic expression
jckt
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Commits on May 27, 2013

Updated symbolic-finite differentiation to use localvars, arguably safer use of eval
jckt
committed