remove redis service from the image

Fix #149
Allow to configure the path to the custom error pages
Merge pull request #173 from willdurand/static-config

Allow to configure the path to the custom error pages
Allow to configure Redis addr/port in functional tests
Merge pull request #182 from willdurand/functional-tests

Allow to configure Redis addr/port in functional tests
Run Python tests on travis-ci
Merge pull request #183 from willdurand/travis-ci-2

[WIP] Run Python tests on travis-ci
Python tests should determine the status of the travis-ci build
Merge pull request #184 from willdurand/travis-ci-3

Python tests should determine the status of the travis-ci build
Merge pull request #176 from willdurand/remove-redis-server

remove redis service from the image