Add scala adapters for doOnEach operator.
Remove unnecessary cast.
Removed spurious package
Moved Subscription object to package rx.lang.scala.subscriptions with the other subscriptions
Added immediate scheduler
Added new thread scheduler
Added current thread scheduler
Added ExecutorScheduler
Added ScheduledExecutorServiceScheduler
Added ThreadPoolForComputationScheduler
Added ThreadPoolForIOScheduler
Deleted old scheduler factory methods.
Deleted old Schedulers object.
Deleted spurious package object.
Added TestScheduler
Deleted spurious package object
Moved stuff around.
Moved stuff around some more.
Fixed doc comment.
Removed dead function, left package object for scala docs.