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Added Silex 2 support so I can bump OpenCFP up to Silex 2 (now that it's officially out). Also added phpunit to the composer.json (just because that's my preferred way to invoke it - I can back that out if that would be better). This does break Silex 1.0 compatibility, so it would probably be a good idea to bump the tag to 2.0 once committed. Resolves issue #54