SPLifetimeGlue: Swizzling instead of subclassing
SPLifetimeGlue: Swizzling instead of subclassing

Subclassing was a bit annoying, since introspection would break (classes would
suddenly have other superclasses, breaking lots of assumptions everywhere in my code).
Tried overriding 'class' and 'superclass' too, but at that point it was so much code
that switching to swizzling was just way easier.

nevyn/SPSuccinct,nevyn/SPSuccinct