Merge branch 'release/0.4.0' into develop

* release/0.4.0:
  Bump version to 0.4.0
Deprecation warning!
NoMethodError: undefined method 'constantize' for Sidekiq::Scheduler:Class
Update lib/sidekiq/scheduler.rb
Merge pull request #13 from mimosa/develop

JRuby 1.7 fixes
Bump version to 0.4.1
Merge branch 'release/0.4.1'

* release/0.4.1:
  Bump version to 0.4.1
  Update lib/sidekiq/scheduler.rb
  NoMethodError: undefined method 'constantize' for Sidekiq::Scheduler:Class
  Deprecation warning!