[GSoC] Patches for shared_ptr array and polymorphic_allocator

[Fan You]

Hi,

According to <http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4335.html#memory.smartptr>

Here is my implementation of

[8.2] Extend shared_ptr to support arrays

[8.3] Type-Erased allocator

Thanks,

Fan
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