Bundle sidekiq sidetiq
Bundle capistrano-sidekiq
Add sidekiq to Capfile
Switch to GitHub version of sidetiq

to resolve issue:

sidetiq-0.5.0/lib/sidetiq/handler.rb:4:in `<class:Handler>': uninitialized constant Sidekiq::ExceptionHandler (NameError)
per https://github.com/tobiassvn/sidetiq/issues/79
Setup sidekiq-web
Update wow engine