Add support for XSD includes.

We treat both includes and imports as referenced schemas so rename variables accordingly.

Implement test case
Fix identifier when loading dependencies.

Use the PHP identifier in case in case it has been modified due to
unsupported characters, uniqueness etc.
Merge pull request #129 from kasperg/xsd-include

Add support for XSD includes.
Fix making parent::__construct params with --constructorNull option

Conflicts:
	src/Wsdl2PhpGenerator/ComplexType.php
Update dependencies.
Release 2.5.2
Fix creating constructor in inheritance (more than one abstraction level) +tests

Conflicts:
	src/Wsdl2PhpGenerator/ComplexType.php
Refactor recursive base type member handling.

Conflicts:
	src/Wsdl2PhpGenerator/ComplexType.php
Update dependencies.
Release 2.5.3