Link epitopes viz

Since you wanted a PR of the latest stuff, here's the very basic viz-inside-the-patient-page that I have right now (with the viz simply below the VCF table)

Also in this PR:
- Removed notes
- Addressed your previous comments
- Moved viz to /templates and /static, and got rid of mako completely
- We run a simple version of the mutation_report pipeline right now, using random MHC, on /patient/ page load
I don't know if it's too bulky but what do you think of `mhc_class_from_normalized_allele_name`?