* Add the required lib 'chardet' in setup.py (#41)

* Update the nlp_reader to avoid feeding label_data when using predict

* Drop the lib "chardet"

* Drop the lib "chardet"

* Drop the lub "chardet"

* Update the nlp reader to avoid feeding label when predicting

* Fix the encoding format

* Add the elmo demo

* Fix the bug that coding type between py2 and py3 in lac-reader

* Add the lib 'chardet' for detecting the coding type.

* Modify the requirement.txt