code: function DiscogsError(statusCode, message){
  	Error.captureStackTrace(this, this.constructor);
  	this.statusCode = statusCode||404;
  	this.message = message||'Unknown error.';
  }
docs: Discogs generic error
  @param {number} [statusCode] - A HTTP status code
  @param {string} [message] - The error message
  @returns {DiscogsError}