Addressing the teacherReplace function issue

[cameronellis]

I was thinking about a more permanent solution to this naming problem than this. I've noticed that there's more than just these professors that are having naming issues.

We could use a separate file so that gradeDist.js, rmp.js, and cape.js could all use the function.

And instead of using a for loop and checking all of them, we could use a hashmap

Thoughts?