Fix/Travis CI#27

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mtulio wants to merge 3 commits intotruly-systems:masterfrom

poikilotherm:tox_docker

Commits on Nov 3, 2017

Relates to #19. Add a simple docker-compose configuration for a test instance with a minimal database import
poikilotherm
committed
Modify travis.yml to use docker containers for tests
poikilotherm
committed
Use tox-travis for test builds on TravisCI, update tox.ini accordingly
poikilotherm
committed