It took me exactly 20 seconds to get the email address behind this ... and I'm not a professional rebus solver. I just happen to know how a base64 and hex encoded string looks like.
Antigen can pull plugins (or modules as prezto calls them) from prezto too. This is a recently added feature which might break occasionally. I personally don't use the prezto loading features in Antigen.
Unfortunately OSX uses a badly outdated openssh version just like many other unix tools and it doesn't support the -W option. You could try upgrading openssh using homebrew if you want.
You should give a try to puma 2.0 currently in beta 6 (https://rubygems.org/gems/puma). Lots of performance improvements. I haven't benchmarked it but my guess is it outperforms unicorn.
For me it's signatures ( http://redmine.yorba.org/issues/5458 ) and a decent full-text-search (on the roadmap).
Only thing remains is what to do with events/invitations..