included complex step finite method for the gradient computation#74

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

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Commits on Aug 15, 2015

included complex step finite method for the gradient computation
flavioluiz
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Commits on Aug 18, 2015

solves a problem for derivative when x = 0
flavioluiz
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