code: public CsvReader ignoreComments(String commentPrefix) {
  		if (commentPrefix == null || commentPrefix.length() == 0) {
  			throw new IllegalArgumentException("The comment prefix must not be null or an empty string");
  		}
  
  		this.commentPrefix = commentPrefix;
  		return this;
  	}
docs: Configures the string that starts comments.
  By default comments will be treated as invalid lines.
  This function only recognizes comments which start at the beginning of the line!
  
  @param commentPrefix The string that starts the comments.
  @return The CSV reader instance itself, to allow for fluent function chaining.