Adding extra team / alumni members

Thanks to @dchelimsky for point out missing people, I'll add them here, still need to add a few more.

- [ ] Dave Astels
- [ ] Aslak Hellesøy
- [ ] Chad Humphries
- [ ] Pat Maddox
- [ ] Luke Redpath
- [ ] Justin Ko
Did I miss an email where Bradley announced he wanted to retire from the team?  I remember one where he said he wanted to take a break but I wasn't aware he was alumni!