Document undocumented action functions (Fixes #646)

Work in Progress pull request to document undocumented action functions.  I've so far gotten around to writing a test that will print a list of undocumented action functions if it fails. Fixes #646

* [x] member_roles_list
* [x] organization_member_create
* [x] group_member_create
* [x] group_member_delete
* [x] organization_member_delete
* [x] package_relationships_list