1.2.2

Fix duplicate namespace imports issue in generated service description.
Fix empty string tag deserialization (returns empty string instead of null).
Fix deserialization of array with merged content and empty values.
New exception type SchemaDefinitionException which describes issues in schema definitions on server side.
New exception type ContractViolationException which describes issues in incoming requests where message differs from service description.
New exception type InvalidQueryException which describes propblems with messages which break SOAP specification.
Refactor usage of existing exception types to use introduced exception types.