0.25.0

• New: RxAndroidPlugins and its RxAndroidSchedulersHook provides a mechanism similar to RxJavaPlugins (and its RxJavaSchedulersHook) for
  changing the scheduler returned from AndroidSchedulers.mainThread() as well as a callback for each subscription on any Handler-based scheduler.
• Fix: Ensure errors are properly propagated from ContentObservable.fromCursor.
• Fix: LifecycleObservable now correctly unsubscribes from its sources.

Breaking changes:

• Users of AppObservable.bindFragment with a support-v4 Fragment should now use bindSupportFragment.