Add arsenicum_sample to test with rails app.
Add sqlite3 to test with Rails.
Reference to PostOffice class.
Change development_dependency: AR -> Rails.
Path pointing is now absolutely.
Fit to current configuration.
Fixed unbootability.
Fix constructor.
Logger initialization fixed.
Logger initialization fixed.
Add configuration fix.
Add ServerConfiguration.
Fix server.
CLI parsing refined.
Forwardable should be an argument of :extend.
queue_class is defined in Configuration ( not in QueueConfiguration )
Add require to weakref.