Resolved problem with special chars in constant names

Possible solution for https://github.com/wsdl2phpgenerator/wsdl2phpgenerator/issues/142.
Discusion is on https://github.com/wsdl2phpgenerator/wsdl2phpgenerator/pull/86.
Short array syntax is not compatible with PHP 5.3 which we also support. Could you change this, please?