[v3] Add hash<shared_ptr> and hash<unique_ptr>

[Paolo Carlini]

Hi all, hi Jon,

I'm about to commit this patch adding two missing std::hash
specializations...

Jon, skimming through unique_ptr.h I don't really understand why we are
using std::tuple instead of the *much* simpler std::pair. Can you? I
think that otherwise we should consider changing that, even if that
means breaking the "ABI" for people already experimenting with the C++0x
unique_ptr, because in the future it will be more and more difficult...
If we can avoid using tuple in unique_ptr, I think <memory> can be made
*much* smaller (it used to be very small), because I'm pretty sure we
don't need the entire <functional>, only some bits, like
functional_hash, and very little else.

Tested x86_64-linux.

Paolo.

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