code: function _formatMessage(message, attribute, rule, parameters) {
      parameters.unshift(_getAttribute(attribute));
  
      for(i in parameters){
        message = message.replace(/:[a-zA-z_][a-zA-z_0-9]+/, parameters[i]);
      }
  
      if (typeof _replacers[rule] === 'function') {
        message = _replacers[rule](message, attribute, rule, parameters);
      }
  
      return message;
    }
docs: replace attributes.
  
  @param {String} message
  @param {String} attribute
  @param {String} rule
  @param {Array}  parameters
  
  @return {String}