Node 8.14 update#7

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pagameba wants to merge 3 commits intopagameba:masterfrom

mapsherpa:node-8.14-update

Commits on Aug 17, 2017

MS_SDE no longer available
cnieman
authored

Commits on Dec 13, 2018

Update to latest Nan, mocha. Replace deprecated callback methods.
Paul Spencer
committed

Commits on Jan 29, 2019

Add toString on error object to prevent a segfault
Paul Spencer
committed