[Feature] new --stop-on-failure option

[muhqu]

I have implemented a --stop-on-failure option. When you run behat --stop-on-failure it will stop after the first failed scenario.

This feature is inspired by phpunit --stop-on-error option.

[muhqu]

Huh... is it really my pull-request that breaks the build on php 5.5?

[muhqu]

just added #274 to fix the failing test

[stof]

typo interuption

[stof]

This looks good to me. What do you think about it @everzet ?

[everzet]

Yep, it looks nice. I've restarted Travis build. If it passes, we can merge this PR.

[everzet]

Oh, wait. One thing, you've forgot to add new option to behat.yml configuration reader:
https://github.com/Behat/Behat/blob/develop/src/Behat/Behat/DependencyInjection/Configuration/Configuration.php#L99-L119

[muhqu]

@everzet I just added it there, but I don't really know what its there for... I'm not so used to this Symfony DI stuff. Any hint on how to validate its now working as expected?

[joshribakoff]

I can't find the documentation for adding this option to behat.yml I figure out on my own its like this:

default:
        options:
                stop_on_failure: ~

[Taluu]

Yup, and also, why put null as a default value for this option, instead of false ?

[stof]

why putting null for a boolean value ?

[Taluu]

Hum, furthermore, it seems that null is the default value for all the other booleans...

[muhqu]

I just choosed what was used for the other booleans.. :-/