angelosalatino/cso-classifier: CSO Classifier v2.3

This new release, contains a bug fix and the latest version of the CSO ontology. Bug Fix: When running in batch mode, the classifier was treating the keyword field as an array instead of string. In this way, instead of processing keywords (separated by comma), it was processing each single letters, hence inferring wrong topics. This now has been fixed. In addition, if the keyword field is actually an array, the classifier will first 'stringify' it and then process it. We also downloaded and packed the latest version of the CSO ontology