Create dataset loader for DECA

Task: NER/NEN, but no NEN for genes and no NER for species, so no canonical NER/NEN
License: custom (included in files)
Format: custom
Citation: @Article{Wang2010,
author = {Wang, Xinglong and Tsujii, Jun'ichi and Ananiadou, Sophia},
journal = {Bioinformatics},
title = {Disambiguating the species of biomedical named entities using natural language parsers},
year = {2010},
month = mar,
number = {5},
pages = {661--667},
volume = {26},
language = {en},
publisher = {academic.oup.com},
}
Source: http://www.nactem.ac.uk/deca/species_corpus_0.2.tar.gz