Make all BigDecimal :to_xml use the to_xml_big_decimal helper method.
Move default_model_query to BaseService class.
Make sure all service model classes are marked as private.
Search_name_query shouldn't be private.
Merge pull request #103 from markrickert/default-model-query

Default model query changes
Merge pull request #102 from markrickert/bigdecimal

Make all BigDecimal :to_xml use the to_xml_big_decimal helper method.