How to permalink to a gist's raw file
Problem: When linking to the raw version of a gist, the link changes with each revision.
Solution:
To return the first file from a gist: https://gist.github.com/[gist_user]/[gist_id]/raw/
To get a file from multi–file gist: https://gist.github.com/[gist_user]/[gist_id]/raw/[file_name]