bump the 'redis-namespace' gem

pin the `redis-namespace` gem in order to pick up a security fix
http://blog.steveklabnik.com/posts/2013-08-03-redis-namespace-1-3-1--security-release
Merge pull request #1146 from benilovj/bump-redis-namespace-for-security-fix

bump the 'redis-namespace' gem
We need Rails 3
Allow configuring worker defaults
Minor refactoring of chain
Bump version
Add back text status, fixes #1182
Show errors for retried jobs
Only need vertical scrollbar, fixes #1116
'Error' string localization is already defined
Merge pull request #1192 from minio-sk/feature-show-errors

Show errors for retried jobs
Supervise Sidekiq::Manager

This should resolve issues where if the manager actor crashes Sidekiq should no longer freeze
Merge pull request #1194 from cpuguy83/supervise_manager

Supervise Sidekiq::Manager
Merge pull request #1165 from josepjaume/master

Allow configuring worker defaults
Update Launcher to monitor the core Actors, #1194
Update changes, version
Polish launcher
@halorgium's sweet hack
Change watchdog to propagate exceptions so Sidekiq quickly dies, #1194.
Rails 4 is supported