Update src/Silex/Application.php

EventDispatcher addListener function has no return value
merged branch janschoenherr/patch-1 (PR #571)

This PR was merged into the master branch.

Commits
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6b248b0 Update src/Silex/Application.php

Discussion
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Update src/Silex/Application.php

EventDispatcher addListener function has no return value

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by GromNaN at 2013-01-02T15:45:08Z

Exact.
https://github.com/symfony/symfony/blob/master/src/Symfony/Component/EventDispatcher/EventDispatcher.php#L88