0.2.0

This updates are centrated in clean and stabilice the project.

This realease breaks some Interfaces and methods. Please update your projects to keep it working:

• ManagerSubscription::create($product, $user): now has the parameter user to indicate who is the owner of the subscription.
• SubscriptionRepositoryInterface::findByProduct: has added the UserInterface parameter.
• SubscriptionRepositoryInterface::findById: new method.