RST fix
Remove postgres from Dockerfile

The concept of docker is all about micro services. Running
multiple services is a bad idea
Run trytond alone as microservice

* Removed sshd
  See why: http://blog.docker.com/2014/06/why-you-dont-need-to-run-sshd-in-docker/

* Removed supervisor since only trytond will now run
Change database to sqlite

It is the problem of downstream Dockerfiles to configure DB settings
Make server verbose
Merge branch 'develop' into 3.2