Created by: vaskonov
- Add ecommerce bot skill with entropy calculation and transferable state.
- Add amazon reader with downloading the dataset from GitHub.
- Add ecommerce test with ONE_ARGUMENT_STATE_INFER_CHECK parameter for state.
- Add bleu_advanced (bleu.py) with all BLEU options and with an ability to disable Penalty.
- Add ecommerce preprocessor: to filter POS, extract Prices, Lemmas etc.
- Change spacy_tokenizer and move here all spacy dependent operations.