Newton's method returns error if finds a stationary point. Change roo…#66

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nichannah wants to merge 1 commit intoCVMix:masterfrom nichannah:65-check-dbz-in-newtons

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Commits on Jun 15, 2016

Newton's method returns error if finds a stationary point. Change root guess if this is the case. Closes CVMix#65 .
Nicholas Hannah
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