Made Silex comaptible with Symfony 2.5
Enabled testing on Symfony 2.5 on Travis
minor #891 Made Silex compatible with Symfony 2.5 (stof)

This PR was merged into the 1.2.x-dev branch.

Discussion
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Made Silex compatible with Symfony 2.5

Commits
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2c12d84 Enabled testing on Symfony 2.5 on Travis
2a7f3db Made Silex comaptible with Symfony 2.5