Support Postgres 9.6

We currently support 9.4.x,

would like to support 9.5.x, or 9.6 (RDS supports it https://aws.amazon.com/about-aws/whats-new/2016/11/amazon-rds-now-supports-postgresql-9-6-1/), and beyond, however the driver has changed somewhat:

Where before we used:

Now the driver seems to have changed to be:

Acceptance:

• update the main services to use the new JDBC driver

• test that the new driver can work with the currently included postgresql docker server container

• upgrade and test the included postgresql docker server container to use Postgresql 9.6.