Permissions need updating for 2.1

@jbpasquier currently this repo has no custom permissions

It's fine at the moment because LDPPermissions analyses the parent model for the child permissions, but for many reasons this won't be the case in 2.1

Currently they are

anonymous_perms = []
authenticated_perms = []
owner_perms = ['view', 'delete']

At first glance I think they should be like this ?

anonymous_perms = []
authenticated_perms = ['add']
owner_perms = ['inherit', 'view', 'change', 'delete']
superuser_perms = []