Evaluation scripts for boilerplate removal

• cleaneval.py (version 1.0)

  cleaneval.py is a fast evaluation script for the CleanEval-1 competition, written by Stefan Evert. It calculates precision, recall and F-score for automatically cleaned text dumps against a manually cleaned gold standard. All files must be in the format mandated for CleanEval-1. Labelled or unlabelled segmentation accuracy can also be calculated in terms of precision, recall and F-score.