Switch to grch37.ensembl.org to download build 37 data

[1.12]

Changed

• Download build 37 data using the https://grch37.ensembl.org/ BioMart, since the https://feb2014.archive.ensembl.org archive is offline now
• Updated several libraries

Fixed

• Updated gunicorn and jinja2 libs, among others, to address security vulnerabilities