Update for compatibility with MongoDB Node.JS Driver v3.x and fix critical security vulnerability#267

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Commits on Jul 25, 2018

fix issues with mongodb 3.x driver
kazfukuda
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Commits on Jul 26, 2018

update referenced mongodb lib version to 3.x
kazfukuda
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update mocha to address https://nodesecurity.io/advisories/534 and https://nodesecurity.io/advisories/146
kazfukuda
committed