Revert mongoengine dependency upgrade#3402

Merged

arm4b merged 4 commits intomasterfrom

revert-3372-upgrade_deps

May 10, 2017

Commits on May 10, 2017

Revert "Upgrade dependencies"
armab
authored
Undo revert for mongoengine
Mierdin
authored
Re-applied changes except for mongoengine
Matt Oswalt
committed
Reverted to old version of mongoengine in requirements.txt
Matt Oswalt
committed