Merge pull request #2 from AdrienGiboire/master

fix bad command line for database config
fix: remove hard dependencies and update
fix: replace `minitest-wscolor` with `minitest-reporters`
improve: set fixtures that allows user to run tests from scratch
fix: downgrade sprockets

There is an exception raised when trying to precompile assets, which
will obviously make heroku deployment fails.

cf. https://github.com/sstephenson/sprockets/issues/566 for details and
following up.
fix: freeze sass gem version

It raises warning such as `Warning. Error encountered while saving cache
b05ef7e3c2046a673504ca75a734e6b26e9498a6/_top-bar.scssc: can't dump
anonymous class #<class:0x007fc531ed7a58>` which breaks assets
compilation.

It's a known bug but for now nobody knows when it will be fixed.
Merge pull request #3 from AdrienGiboire/master

improve: ignore `.ruby-version`
Merge pull request #4 from AdrienGiboire/fix/deps

fix: hard dependencies
Merge branch 'master' into fix/tests

Conflicts:
	Gemfile.lock
Merge pull request #5 from AdrienGiboire/fix/tests

fix: tests workflow
Merge branch 'master' into feature/12factor_compliance

Conflicts:
	Gemfile.lock