Make behat more analogue to phpunit about behat HOT 3 CLOSED

@schmittjoh the interesting part about that is Behat doesn't and shouldn't have assertion lib bundled with it. The cool part is that you can use whatever assertion tool you like. One requirement though is that assertions should throw exceptions :-)

My choice is PHPUnit assertions :-) And yes, you can use them very nicely with Behat. For example take a look at Behat feature suite:
https://github.com/Behat/Behat/blob/master/features/bootstrap/FeatureContext.php
https://github.com/Behat/Behat/blob/master/features/bootstrap/FeatureContext.php#L8
https://github.com/Behat/Behat/blob/master/features/bootstrap/FeatureContext.php#L138

;-)

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Yeah, I like it. Maybe add a note about this power to the docs?

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Added: https://github.com/Behat/Behat-docs/commit/926fa8babf0af4878131b99977f8652443f5eb04.
http://docs.behat.org/ updated accordingly ;-)

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