Add support for NRC Emotion Intensity Lexicon and Valence, Arousal, Dominance Lexicon

[Emil Hvitfeldt]

NRC Emotion Intensity Lexicon (aka Affect Intensity Lexicon) http://saifmohammad.com/WebPages/AffectIntensity.htm

NRC Valence, Arousal, Dominance Lexicon
http://saifmohammad.com/WebPages/nrc-vad.html

For lexicon_nrc_eil:

http://saifmohammad.com/WebDocs/NRC-AffectIntensity-Lexicon.txt​
@inproceedings{LREC18-AIL,
author = {Mohammad, Saif M.},
title = {Word Affect Intensities},
booktitle = {Proceedings of the 11th Edition of the Language Resources and Evaluation Conference (LREC-2018)},
year = {2018},
address={Miyazaki, Japan}
}

For lexicon_nrc_vad:

http://saifmohammad.com/WebDocs/VAD/NRC-VAD-Lexicon-Aug2018Release.zip
@inproceedings{vad-acl2018,
title={Obtaining Reliable Human Ratings of Valence, Arousal, and Dominance for 20,000 English Words},
author={Mohammad, Saif M.},
booktitle={Proceedings of The Annual Conference of the Association for Computational Linguistics (ACL)},
year={2018},
address={Melbourne, Australia}
}