Rename xtol, ftol to x_tol, f_tol#216

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amrods wants to merge 2 commits intoJuliaNLSolvers:masterfrom

Commits on May 24, 2019

rename xtol, ftol to x_tol, f_tol
amrods
committed

Commits on May 25, 2019

rename xtol, ftol to x_tol, f_tol in test
amrods
committed