Log Message:
Update to 0.55

Upstream changes:
0.53    31 Oct 2012
        * add list_related and view_related primarily for REST support

0.54    5 Nov 2012
        * add Results->serialize() method
        * refactor some Controller methods into a Role class
        * Model::File->fetch() now returns undef if file does not exist. Add \ 
Model::File->prep_new_object().
        * add new required method to Object class: is_new()
        * add Model->put_related method

0.55    28 Jan 2013
        * add Iterator->serialize() method.