Fix bugs in Feature.
Fix bugs in FeatureVector.
Fix bugs in Ranker.
Fix bugs in FeatureManager.
Fix bugs in Normalizer.
Fix bugs in RankList.
Fix bugs in DefaultNormalizer.
Fix bugs in SVMRanker.
Fix bugs in Letor::Internal.
Fix bugs in Letor.
Fix bugs in FeatureSelector.
Fix bugs in StringHelper.