Ensure tests after the InstallCommand test will have a clean database.
Previous attempt failed because of a foreign key
Also, nightly on Travis seems to target PHP 7.2-dev, so I put 7.1 in requirement and moved nightly in allowed failures.
And it seems xdebug isn't shipped with PHP 7.1, so I added a workaround to avoid build to fail when trying to remove xdebug.ini file.
Run php-cs-fixer to avoid CS on commits
Add a check on translation message using the built-in yaml validator. It'll avoid typo in translation yaml files.
Use travis_wait to avoid travis timeout on `composer up`
Jump to `memory_limit -1` for `composer up`
Also, since composer.lock is ignored, we can remove it.
It will slow down the whole test suite (because it'll use doctrine command).
Remove unecessary `KernelTestCase`.
Also rename `AbstractControllerTest` to `WallabagApiTestCase` for consistency.
It takes ages to process and most of the time the build fail for "execution time" too long.
Too much time already burned to investigate it.
We'll investigate later, it's not a priority atm.
They are god damn too long to execute because it launch external command (mostly related to doctrine).
So I've added a PHPUnit @group (`command-doctrine`) so that we can avoid launching them on a regular basis, like that:
`phpunit --exclude-group command-doctrine`
