code: function permissions (user, configName, callback) {
      return get(configName).schema.statics.getPermissions(user, callback);
  }
docs: Retrieve the permissions DSL for a config
  @param  {Object}   user      The user to which the permissions DSL should be customised
  @param  {String}   configName The name of the config
  @param  {Function} callback  A callback to return the permissions DSL to
  @return {Void}