Updated committed! and rolledback! interface

In ActiveRecord adapter missed rolledback! callback

Example:

```ruby
ActiveRecord::Base.transaction do
  MyJob.enque
  raise ActiveRecord::Rollback
end

# NoMethodError: undefined method `rolledback!' for
# <Que::Adapters::ActiveRecord::CommittedCallback:0x00000007fd7c38>
```

So i have changed class name of `CommittedCallback`, and update `committed!` and `rolledback!` interface