title: Multi-User Restricted Access with Python Eve
body: <p>Currently, Eve v0.4 supports User-Restricted Resource Access via the 'auth_field', but it seems to be designed to automatically handle the single-owner case.</p>
  
  <p>How would you enable multi-user restricted access, where a user is allowed to view the resource if their id was included in an array of permitted ids? Potentially with multiple lists for separate read and write permissions.</p>