[WIP] Pin PostgreSQL install to 9.6#153

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ajvb wants to merge 3 commits intomasterfrom

ajvb/upgrade-postgres

Commits on Aug 6, 2017

Have debian_install.sh install postgres 9.6
AJ Bahnken
committed
Install 9.6 from postgresql.org's apt repo
AJ Bahnken
committed
Pin docker-compose's postgres to 9.6
AJ Bahnken
committed