Add zones to taxes and shipping, refactor Behat contexts
Update taxation bundle
Initial assortment features

* Add drafts of option, property and prototype features.
* Update vendors.
Add basic product scenarios
Add step definitions and adjust features
Tweak the assortment features and configuration

* Update vendors.
* Adjust the assortment bundle features.
* Tweak the Behat configuration.
* Add StofDoctrineExtensionsBundle.
Add product variants scenarios, use lower case btn labels
Update SyliusWebBundle
Add variant generation and prototype building features
Merge pull request #10 from Sylius/assortment-bundle-integration

Initial assortment features
Add tax category to product
Update vendors
Update SyliusTaxationBundle
Update taxation management interface
Remove tax category details page
Update SyliusShippingBundle, remove shipping method details page
Use latest addressing bundle