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 I am open to better alternatives :)

What we need is:

- a way to pass custom configure options (builds automation)
- a way to store logs at a given path
- a way to disable any other interactions

Whatever fits for that is good for me.