Improve article attribution heuristic

[jugglinmike]

Make the attribution algorithm trace through the history
across file rename operations, but do not consider such operations as an
indication of contribution.

The compiled output is a single line of JSON, making it a bit tough to inspect.
Here's what I did to try it out:

$ git checkout -b tmp master
$ grunt
$ git add -f dist
$ git commit -m "Current build"
$ git pull git@github.com:jugglinmike/learn.jquery.com.git follow-moves
$ grunt
$ git diff --word-diff --word-diff-regex="[^,\{]"

Basically, it adds contributors who created/edited articles prior to 0fb17c3 (including yours truly) and removes contributors whose only interaction with an article was to move it (i.e. @rdworth in 0711375 and 7b49f82).

[ajpiano]

This is awesome, @jugglinmike. I'll give it a try but this solves a real problem that I didn't think we had a solution for! Have you signed the CLA? If not, now's a good time!

[rdworth]

Thank you @jugglinmike . This has been bothering me for a while, so I'm happy to have a solution in sight

[jugglinmike]

I have indeed signed the CLA. Don't you guys remember my monumental contribution to jQuery core?