Some improvements

* Added contributors list to `composer.json` (linked to github contributors graph)
* Improved Behat context
* Fixed/Cleaned/Tested configure options handling
* add `--default` option to `install` command
@stof

> dispalying the logs would actually be a good candidate for something based on the output verbosity rather than an interaction

:+1:

> it may be possible to pass an option file (better than creating a weird syntax to pass the values in a CLI option)

:+1: