Fixed ExceptionNotifier test
Merge pull request #910 from dimko/patch-3

Fixed ExceptionNotifier test
Pro changes
More intelligent redis error handling for job fetch
Sidekiq will now shut down successfully if Redis is down.
Add Sidekiq::Actor which provides a testable alternative to Celluloid
Upgrade to Celluloid 0.14, remove defer usage, fixes #919
Switch to threaded tasks, see also celluloid/celluloid#251
Upgrade to Minitest 5
Remove usage of multi_json gem
Merge remote-tracking branch 'upstream/master'