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

Open

kazfukuda wants to merge 3 commits intoOptimalBits:masterfrom

medipass:master

Commits on Jul 25, 2018

fix issues with mongodb 3.x driver
kazfukuda
committed

Commits on Jul 26, 2018

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