[PATCH] [clang-tidy] Add a namespace checker.

[Benjamin Kramer]

Use early exits, add TODOs.

http://reviews.llvm.org/D4523

Files:
  clang-tidy/google/CMakeLists.txt
  clang-tidy/google/GoogleTidyModule.cpp
  clang-tidy/google/UnnamedNamespaceInHeaderCheck.cpp
  clang-tidy/google/UnnamedNamespaceInHeaderCheck.h
  clang-tidy/google/UsingNamespaceDirectiveCheck.cpp
  clang-tidy/google/UsingNamespaceDirectiveCheck.h
  test/clang-tidy/Inputs/google-namespaces.h
  test/clang-tidy/google-namespaces.cpp
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