Add Session Interface, require session handler to implement SessionHandlerInterface
Add Router interface
Add View interface
Add Route interface
Add Flash interface
Add Crypt interface
Collection to expect interfaces
Add Response interface
Add Request interface
Fix Headers phpdoc
Cookies encrypt to depend on interface
Remove extra definition
Fix missing parameter
Empty Headers and Cookies interfaces
Fix the Session and Flash interfaces
Fix classes for interfaces
Make App look for ViewInterface instead of View
Fix unit test
Add Session handler interface for php < 5.4 support
Include static function getMessageForCode() in Slim\Interfaces\Http\ResponseInterface.