fix for #14 related to update_objs_from_data method using pk_field override
add a test for pk_field overrides and update_objs_from_data for issue #14, also change previous test name
Merge pull request #15 from thebigspoon/pk_field_override_fix

Pk field override fix
Merge pull request #16 from thebigspoon/master

Small change to setup.py to get imporlib working