Fix mangrove crash#43

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aospan wants to merge 7 commits intomongodb-labs:masterfrom

Commits on Sep 14, 2018

Fix mangrove crash
aospan
committed

Commits on Dec 13, 2018

Fix embedded doc exception with new mongo-cxx
aospan
committed

Commits on Dec 19, 2018

fix exception while 'insert_many'
aospan
committed