[PATCH] Implement std::experimental::sample

[Marshall Clow]

================
Comment at: include/experimental/algorithm:85
@@ +84,3 @@
+  return _VSTD_LFTS::__sample(
+      __first, __last, __out, __n, __g,
+      typename iterator_traits<_PopulationIterator>::iterator_category(),
----------------
I think that should forward the RNG: `_VSTD::forward<_UniformRandomNumberGenerator>(__g)`

http://reviews.llvm.org/D9044

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