More touchups on THIRD-PARTY.md

Adding missing copyright statements on included gems. Thanks to
@bturner-r7 for noticing.
Updating COPYING with new year

I am pretty sure this is incorrect, but at least it should be consistent
with the calendar if it's going to be incorrect.
Add nokogiri and thin
Adding msgpack, windows gems, with new licenses

Included Apache and Artistic license texts.
Merge pull request #1226 from todb-r7/third-party