Migrate hasjob to AWS

[karthikb351]

Current implementation	On AWS
Hasjob server under uwsgi	Docker container running hasjob under uwsgi
Postgres database running locally	AWS RDS Postgres
Redis service running locally	Redis container for hasjob containers to talk to
Postfix service running locally	Postfix running within hasjob’s container
Lastuser service via HTTP (but essentially local)	Lastuser via HTTP (not local) or should Lastuser be migrated to AWS too?

Tasks

• [x] Setup environment for hasjob within docker
• [x] Hasjob talks to external redis container
• [x] Hasjob has docker specfic config file that reads from env vars
• [ ] Start up script for docker which auto runs migrations on booting up the container (#305)
• [x] Postfix config that reads from env vars (#306)
• [ ] Populate Amazon RDS with dummy data (#307)
• [ ] Setup Travis to build docker images and push to Docker Hub (#310)