[PATCH] Provide user name in ClangTidyOptions.

[Alexander Kornienko]

Use llvm::None to signal that there's no value for the User setting.

http://reviews.llvm.org/D5440

Files:
  clang-tidy/ClangTidyOptions.cpp
  clang-tidy/ClangTidyOptions.h
  clang-tidy/google/TodoCommentCheck.cpp
  clang-tidy/google/TodoCommentCheck.h
  clang-tidy/tool/ClangTidyMain.cpp
  unittests/clang-tidy/ClangTidyOptionsTest.cpp
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