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.
Is this line even necessary given the change above? As I see it all special chars should be removed on L244.

Perhaps this should be reduced to `preg_replace('\s', '_', $name)` to convert spaces to `_`.