v0.8.0: API & Swift version updates
- Global disposable stages are now reset via Disposables.stage - Builder methods moved to Disposables - AnyDisposable -> AutoDisposable - .erase() -> .auto() - AutoDisposables can now *lose* their ownership via `take()` - They can be tested for ownership with `.hasOwnership` - DisposableStages take ownership from AutoDisposables maintaining previous behavior. - ErasedDisposable introduced and does not have ownership / auto-dispose. - created via .erased()