[PATCH] [libcxx] Add <experimental/ratio>

[Eric Fiselier]

Add a test that ensures `<ratio>` is included and is also standard.


http://reviews.llvm.org/D7351

Files:
  include/experimental/ratio
  test/libcxx/experimental/utilities/ratio/header.ration.synop/includes.pass.cpp
  test/libcxx/experimental/utilities/ratio/version.pass.cpp
  test/std/experimental/utilities/ratio/header.ratio.synop/includes.pass.cpp
  test/std/experimental/utilities/ratio/header.ratio.synop/ratio_equal_v.pass.cpp
  test/std/experimental/utilities/ratio/header.ratio.synop/ratio_greater_equal_v.pass.cpp
  test/std/experimental/utilities/ratio/header.ratio.synop/ratio_greater_v.pass.cpp
  test/std/experimental/utilities/ratio/header.ratio.synop/ratio_less_equal_v.pass.cpp
  test/std/experimental/utilities/ratio/header.ratio.synop/ratio_less_v.pass.cpp
  test/std/experimental/utilities/ratio/header.ratio.synop/ratio_not_equal_v.pass.cpp
  test/std/experimental/utilities/ratio/nothing_to_do.pass.cpp

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