title: Query PFObject based on ACL in CloudCode
body: <p>I'd like to create a scheduled job which iterates through all objects of a PFObject class that are "owned" by a specific user, which is dynamic. Ownership is defined by the default ACL in the app, which is set to allow read/write access only to the current user, so every row of this PFObject will only be accessible to that particular user.</p>
  
  <p>I know I'll need to use the master key in this CloudCode function so I can access objects that are normally not readable. How can I construct a PFQuery to return objects that are visible by a particular user? I can create the ACL in CloudCode, can I set this ACL on a PFQuery?</p>