Remove lower bound on size of epsilon#131

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briochemc wants to merge 4 commits intoJuliaMath:masterfrom briochemc:master

+179-124

Commits on Apr 8, 2019

fix - jacobian's x type consistency
briochemc
committed

Commits on Apr 9, 2019

Commits on Apr 10, 2019

fix hessian to use hessianrule?
briochemc
committed