Allow calling of `-stopObserving` inside `-dealloc` to work when observing self.
No longer is is necessary to find an appropriate place to stop observation before deallocation (you still need to do it manually though).
Allow arm64 builds.
Merge branch 'master' into magic_deregister

Conflicts:
	THObserversAndBinders/THObserver.m
	THObserversAndBindersTests/THOBTestSelfObservationTestObject.m
	THObserversAndBindersTests/THObserversAndBindersTests.m