* Removed `PADRINO_ENV`. Use `RACK_ENV` instead.
* Refactored:
  * `Sidekiq.hook_framework!` to `Sidekiq::Framework.hook!`
  * `Sidekiq.framework_root` to `Sidekiq::Framework.root`
  * Root checking into `Sidekiq::Framework.root?`
  * `Sidekiq.hook_framework!` into `Sidekiq::Framework::(Padrino/Rails).hook!`