Released version 2.5.0

• added Factory
• Method, Parameter: added support for PHP 7.1 nullable types
• Parameter::from() prevents fatal error when default value is not resolvable
• ClassType: improved rendering of anonymous classes
• add Constant; class constants can have declared visibility and comment
• refactoring: extracted base class Member for properties, methods and constants
• Method::from() sets visibility 'public'
• Parameters: added hasDefaultValue() as replacement of isOptional()
• deprecated Parameter::from() and Property::from() (BC break)