[PATCH] [libcxx] Add <experimental/utility> header for LFTS.

[Eric Fiselier]

Hi mclow.lists,

This patch adds the `<experimental/utility>` header as specified in the latest draft of the library fundamentals TS.

`<experimental/utility>` only contains `class erased_type`. 

This patch also updates the documentation to list the `erased_type` class as "initial implementation complete".

http://reviews.llvm.org/D4510

Files:
  include/experimental/utility
  test/experimental/utilities/nothing_to_do.pass.cpp
  test/experimental/utilities/utility/utility.erased.type/erased_type.pass.cpp
  test/experimental/utilities/utility/utility.synop/includes.pass.cpp
  test/experimental/utilities/utility/version.pass.cpp
  www/ts1z_status.html
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