Added property validationError to XML document after calling XmlDocum…

…ent::Validate.

This gives an ability to see validation error when validating XML with an XSD.

Conflicts:
	src/xml_document.cc

src/xml_document.cc

@@ -332,6 +332,9 @@ NAN_METHOD(XmlDocument::Validate)
     }
     bool valid = xmlSchemaValidateDoc(valid_ctxt, document->xml_obj) == 0;
 
+    xmlSetStructuredErrorFunc(NULL, NULL);
+    args.Holder()->Set(v8::String::New("validationErrors"), errors);
+
     NanReturnValue(NanNew<v8::Boolean>(valid));
 }