Patron Stat Cat Enhancements: Add OpenSRF CRUD methods for actor statistical category...

Patron Stat Cat Enhancements: Add OpenSRF CRUD methods for actor statistical category default entries.

Added methods to create, delete, update default entries for patron statistical
categories.  Modified create_stat_cat and create_stat_cat_entry to also create,
update stat_cat_entry_default objects if present in the request.

Signed-off-by: Scott Prater <sprater@gmail.com>
Signed-off-by: Ben Shum <bshum@biblio.org>
Signed-off-by: Thomas Berezansky <tsbere@mvlc.org>