CHANGELOG
=========
2.1.0
-----
* added IntrospectableContainerInterface (to be able to check if a service
has been initialized or not)
* added ConfigurationExtensionInterface
* added Definition::clearTag()
* component exceptions that inherit base SPL classes are now used exclusively
(this includes dumped containers)
* [BC BREAK] fixed unescaping of class arguments, method ParameterBag::unescapeValue() was made
public