- Added transformer, predict.Transformer and transformer_download_model
- Extended Python code to include architecture which can be one of the following: "BERT", "GPT", "GPT-2", "CTRL", "Transformer-XL", "XLNet", "XLM", "DistilBERT", "RoBERTa", "XLM-RoBERTa"
- Unit tests added
- Added BERT and predict.BERT
- Added bert_download_model