Fix apostrophe regex for name

Hi Meagan,

I pulled the code that we were working on today, and I kept getting an error because the dates in the two source files (at least the ones that I downloaded) only have two-digit years. I made a slight edit to the add_datetime method to account for this, and I also got the format_name method's apostrophe regex logic working.

However, I want to make sure that these changes work on your end as well before merging this branch into master. When you get a chance, can you test it out?

Thanks,
Taryn