Add option to disable audit logs django admin registration in admin.py file.

[ojaragodwin]

• Right now users cant make their own custom django admins from the auditlog model because its already registerd in the package.
• Unregistering it works but fails when tests runs. i think its because of the difference of how modules are loaded during running tests and server start up
• Adding a setting variable would be of much help when some one needs to write their own entirely.