code: function(options, callback) {
      if(typeof(callback) !== 'function') {
        return false;
      }
      else if(typeof(options) !== 'object') {
        var error = { error: true, message: ERROR_BAD_PARAMS_OPT };
        callback(error, null);
        return false;
      }
      else {
        return true;
      }
    }
docs: Checks if params are good. If they are, returns true.
  Else it will return false and call the callback with an error (if available).
  
  @private
  @param  {Object}   options  Object part of params to check.
  @param  {Function} callback Callback function part of params to check.
  @return {Boolean}           true if params are good, false otherwise.