Merge HGNC synonyms into UniProt resource file

[bgyori]

This PR integrates human gene/protein synonyms from HGNC into the UniProt resource file (uniprot-proteins.tsv.gz) so that they are treated as "equal". This fixes #55.

Specific changes are:

• Migrate code from update_hgnc_genes.py into update_uniprot_proteins.py
• Remove hgnc from ner_kb.config
• Remove kb/hgnc.tsv.gz
• Update extended uniprot-proteins.tsv.gz and ner/Gene_or_gene_product.tsv.gz

This requires changes in Reach as well which I am working on and will PR there.

[MihaiSurdeanu]

LGTM!

@kwalcock or @enoriega : if tests pass, can you please merge?