Fix Boost.Hash workaround for std::shared_ptr
Fix Boost.Hash workaround for std::shared_ptr

Ignore-this: a126735b28946f3eb9ba2daa8605352a

darcs-hash:20150314153415-fa073-c79f914d2a05a1d39efd367f1019ab0c9e85c816

rogiervd/flipsta,rogiervd/flipsta,rogiervd/flipsta