[UPDATE] enhancements and bug fixes

[UPDATE] enhancements and bug fixes
Add owner feature in order to know the owner of a current struct
attribute/value or the owner of a current function. The owner must be a
WsdlToPhpModel object type.
Ensure case sensitive unique naming of methods (setters, getters and
operations) by using generic WsdltoPhpModel::uniqueName() method.
Sort case sensitively return types in the getResult() method php doc.
Refactoring WsdlTophpStructValue::getCleanName() method fixes #6 Github
issue concerning PHP Warning : Strict Standards: Declaration of
WsdlToPhpStructValue::getCleanName() should be compatible with
WsdlToPhpModel::getCleanName() in WsdlToPhpStructValue.php on line 107