removed an empty line in README
Merge pull request #22 from havvg/master

small simplification of example in README
re-added a type hint
extracted duplicate code for form creation into a new method
add route params to dynamic step links
change order of applying route params in step list
Merge pull request #23 from havvg/hotfix/fix-steplist-links

add route params to dynamic step links
updated description in composer.json
preserve given validation_groups option
unified types in phpdoc comments
added a note on Symfony 2.0.x compatibility
added method `has` to StorageInterface
make use of Request's `isMethod` method, based upon https://github.com/symfony/symfony/pull/3800
update `getDefaultOptions` methods in README example code
fixed phpdoc regarding type of form data in event classes because it's usually an object
added the flow instance itself as a property in events (to allow accessing it when using event handlers separated from the flow class)
throw an exception if the number of steps doesn't match the number of step descriptions
updated example code to reflect latest form component changes (#27)
use `bind` instead of `bindRequest`, based upon https://github.com/symfony/symfony/pull/4811
updated installation instructions for usage with Composer (fixes #27)