Update past-exec.md and exec.md; Create exec-W16.md; Fixes #166

[techiechelle]

No description provided.

[evykassirer]

Looking sweet! Nice work figuring out all the file changes.
You can see what the new website looks like at https://wics-site-pr-204.herokuapp.com/our-volunteers/
The last step is to squish all your commits together so there's only one commit in this pull request.

This is something that was confusing to me for a while, so I'm gonna explain it here just in case (sorry if you already know how to do it)
Docs about the command you use: https://help.github.com/articles/about-git-rebase/

First do git rebase -i HEAD~8 to say you want to squish all the commits since 8 behind your current position
Then you will see a list of all your commits. Keep the first one as pick ___, and then choose fixup (or you can just type f) for the rest of the commits. Save and close, and there should just be one commit there! 🎉 (you can do git log to confirm that)

When you push that change, you'll have to do git push --force because git will be confused and think you're missing all the commits (when really you just turned them all into a new single commit)

[ehashman]

There is a typo: this term should have "Big CSters Director", not plural.

[techiechelle]

I made a commit to fix the typo

[fboxwala]

You will still need to squash your commits (as evy described above) before we can merge

[ehashman]

This should be Big CSters Director not Directors.

[fboxwala]

lgtm!