* Support computing nbest oracle WER.
* Add scale to all nbest based decoding/rescoring methods.
* Add script to run pretrained models.
* Use torchaudio to extract features.
* Support decoding multiple files at the same time.
Also, use kaldifeat for feature extraction.
* Support decoding with LM rescoring and attention-decoder rescoring.
* Minor fixes.
* Replace scale with lattice-score-scale.
* Add usage example with a provided pretrained model.
