Composer update.
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  - Removing sebastian/environment (1.1.0)
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  - Removing phpunit/phpunit (4.3.1)
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  - Installing guzzlehttp/streams (2.1.0)
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  - Removing fabpot/goutte (v1.0.6)
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  - Removing behat/mink (v1.5.0)
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  - Removing behat/mink-browserkit-driver (v1.1.0)
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  - Removing behat/mink-goutte-driver (v1.0.9)
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  - Removing kriswallsmith/assetic (v1.1.2)
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  - Removing instaclick/php-webdriver (1.0.17)
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  - Removing behat/mink-selenium2-driver (v1.1.1)
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  - Removing doctrine/dbal (v2.4.2)
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  - Removing pdepend/pdepend (2.0.2)
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