Two DB docker updates

[WinnyTroy]

When running KPI via docker with the new setup, these are afew items that need to be updated

• Introduce KPI docker-compose file

KPI doesnt define this docker-compose file in their kobotoolbox/kpi repository. They have this instead defined in the kobotoolbox/kobo-docker repository.
The docker-compose file will now help us manage the KPI and postgres docker containers.

• Introduce KPI docker settings file

KPI doesnt define a settings file to work with Docker. They make use of this file, which points to the base setting file.
We are introducing this docker settings file in an effort not to alter the base setting file.

• Update docker/init.bash script

We need to update the init bash script here to handle migrations appropriately. These updates include:

1. Create KPI DB and user and grand persmissions for DB to user
2. Create Dump for KPI tables to new KPI DB
3. Run migrations after tables have migrated in dump

Resolves part of #26