OAPHs are now no longer scheduled
Avoid subscribing to the source until a value is read for the first time
MessageBus's default scheduler is now CurrentThread
Updating derived collections are now not scheduled
This and That
Fix up an OAPH test
Fix failing tests related to Splat 1.2 upgrade
Merge pull request #516 from reactiveui/no-more-scheduling

No more scheduling + Lazy ToProperty