***************************************************************************
@constructs ObjectAcl
@description ObjectAcl description
@memberof carbond.security
@extends carbond.security.Acl
function() {
    /***************************************************************************
     * @property {xxx} object -- xxx
     */
    this.object = null

    /***************************************************************************
     * @property {xxx} ownerField -- xxx
     */
    this.ownerField = '__owner__'

    /***************************************************************************
     * @property {xxx} permissionDefinitions -- xxx
     */
    this.permissionDefinitions = { // mapping of permissions to defaults
      read: false,
      write: false,
      delete: false,
      admin: false
    }
  }