## Description
Fixes#591.
## Rationale
We are currently not testing many combinations, we run Flake8 on the generated project with default options, but that rarely catch any issues.
## Use case(s) / visualization(s)
Catch problems with invalid combinations, for instance, it fails due to Whitenoise breaking flake8 with `django-compressor` because `STATIC_URL` was undefined here:
b91c70d755/%7B%7Bcookiecutter.project_slug%7D%7D/config/settings/production.py (L185)
* Create a test matrix on Travis CI to help testing multiple options
* Change test_docker.sh to fail if any command in it fails
* Run black on the CI with --check option
* Fix formatting of project files using black
* Install black in the docker container
* Exclude migrations in black checks
* Fix Black formatting violations
* Run black on the whole generated project & fix issues
* Prettify and re-order settings entries
* Use old-style .format() for the time being
* Remove redundant linebreaks at the settings files' beginning
* Fix E303 too many blank lines
* Remove a redundant linebreak from requirements.txt
* Some linebreake juggling in config.settings.base
* More inline docs for DATABASES variable
Use of database url is not part of Django, but comes from django-environ. Was initially confusing where feature came from, as link points to offical django docs.
* Contributors update
* Introduce static asset build infrastructure
* Enhance gulpfile.js
* Introduce node service
* BrowserSync debug-only support
* Remove newline before BrowserSync debug-only support section
* FIx node Dockerfile package.json COPY
* Try fiixing node Dockerfile package.json COPY ones again
* Switch to `node:7-slim`
* Try switching to node:6
To account for possible node:7 docker-compose incompatibiltiy
* Revert "Try switching to node:6"
This reverts commit 62cc02df1a.
* Try switcging workdir to /app
* Try utilizing relative package.json path
* Resetting to the last version working locally with docker-compose 1.11.x
* Build upon the latest node:7.9-slim
* Stop dockerignoring package.json
* Fix typo
* Try a different package.json path
* Revert "Try a different package.json path"
This reverts commit f29f8500b8.
* Revert "Fix typo"
This reverts commit 02033729b5.
* Revert "Stop dockerignoring package.json"
This reverts commit 63c5491546.
* Upgrade docker-engine and docker-compose used by Travis CI
* Fix .travis.yml comments
* Inline docker-engine and docker-compose versions
* DEBUG: pwd
* Revert "DEBUG: pwd "
This reverts commit 6c2ed4321a.
* Try copying package.json to the same dir as node Dockerfile's
* Revert "Try copying package.json to the same dir as node Dockerfile's"
This reverts commit 24340a0783.
* Try out node:7.9
* Revert "Try out node:7.9"
This reverts commit 32286d33c2.
* Revert "Upgrade docker-engine and docker-compose used by Travis CI"
* Get rid of npm-check-updates
Reason: Reserved for the upcoming PR
* Get rid of npm-check
Reason: Reserved for the upcoming PR
* Get rid of 'standard' npm package
Reason: Reserved for the upcoming PR
* Clean up package.json
* Preserve package.json uncoditionally
Since we now have *unconditional* node.js integration, `package.json` must be out there whenever `node` service gets built
* Upgrade node service image to 7.10
* Document Node.js-Docker integration
* Fix gulpfile.js images region name
* Get rid of Gulp migrate task
* Document Gulp-Docker integration
* Introduce static asset build infrastructure
* Enhance gulpfile.js
* Introduce node service
* BrowserSync debug-only support
* Remove newline before BrowserSync debug-only support section
* FIx node Dockerfile package.json COPY
* Try fiixing node Dockerfile package.json COPY ones again
* Switch to `node:7-slim`
* Try switching to node:6
To account for possible node:7 docker-compose incompatibiltiy
* Revert "Try switching to node:6"
This reverts commit 62cc02df1a.
* Try switcging workdir to /app
* Try utilizing relative package.json path
* Resetting to the last version working locally with docker-compose 1.11.x
* Build upon the latest node:7.9-slim
* Stop dockerignoring package.json
* Revert "Stop dockerignoring package.json"
This reverts commit 63c5491546.
* Fix typo
* Revert "Fix typo"
This reverts commit 02033729b5.
* Try a different package.json path
* Revert "Try a different package.json path"
This reverts commit f29f8500b8.
* Upgrade docker-engine and docker-compose used by Travis CI
* Fix .travis.yml comments
* Inline docker-engine and docker-compose versions
* DEBUG: pwd
* Revert "DEBUG: pwd "
This reverts commit 6c2ed4321a.
* Try copying package.json to the same dir as node Dockerfile's
* Revert "Try copying package.json to the same dir as node Dockerfile's"
This reverts commit 24340a0783.
* Try out node:7.9
* Revert "Try out node:7.9"
This reverts commit 32286d33c2.
* Revert "Upgrade docker-engine and docker-compose used by Travis CI"
* Get rid of npm-check-updates
Reason: Reserved for the upcoming PR
* Get rid of npm-check
Reason: Reserved for the upcoming PR
* Get rid of 'standard' npm package
Reason: Reserved for the upcoming PR
* Clean up package.json
* Preserve package.json uncoditionally
Since we now have *unconditional* node.js integration, `package.json` must be out there whenever `node` service gets built
* Upgrade node service image to 7.10
* Document Node.js-Docker integration
* Fix gulpfile.js images region name
* Get rid of Gulp migrate task
* Document Gulp-Docker integration
* Remove Gulp-Docker integraton not supported initialization message
