* fix the licence, test=doc

* Update ctc_beam_search_decoder.cpp

* Update ctc_beam_search_decoder.h

* Update ctc_greedy_decoder.cpp

* Update ctc_greedy_decoder.h

* Update decoder_utils.cpp

* Update decoder_utils.h

* Update path_trie.cpp

* Update path_trie.h

* Update scorer.h

* Update scorer.cpp

[install] remove nltk deps

[Setup] fix requirement

[cli]update cli unit test, test=doc

[doc]update frontend readme, test=doc

* add test_cli.sh

* set -e

* updated ASR released model

* update the doc, test=doc_fix

[TTS] Add support for finetuning speedyspeech

[CLI] st:  unified config for st

[tts]fix tone_sandhi of yi