Redis module for Site package.
Config options for Redis.
Merge branch 'fix-gearman-error-handler' into add-redis-module
Merge branch 'fix-gearman-error-handler' into add-redis-module
Improve connection handling in Redis module.

Now does a lazy connect and maintains connected/disconnected status when
running commands.
Merge branch 'add-redis-module' into add-gearman-can-work
Add comment about signal handling.