[PATCH] Implemented clang-tidy configurability via .clang-tidy files.

[Alexander Kornienko]

Hi djasper, klimek, bkramer,

This adds a support for the .clang-tidy file reading using
FileOptionsProvider, -dump-config option, and changes tests to not depend on
default checks set.

http://reviews.llvm.org/D5186

Files:
  clang-tidy/ClangTidy.cpp
  clang-tidy/ClangTidy.h
  clang-tidy/ClangTidyDiagnosticConsumer.cpp
  clang-tidy/ClangTidyDiagnosticConsumer.h
  clang-tidy/ClangTidyOptions.cpp
  clang-tidy/ClangTidyOptions.h
  clang-tidy/tool/ClangTidyMain.cpp
  test/clang-tidy/Inputs/config-files/
  test/clang-tidy/Inputs/config-files/.clang-tidy
  test/clang-tidy/Inputs/config-files/1/
  test/clang-tidy/Inputs/config-files/1/.clang-tidy
  test/clang-tidy/Inputs/config-files/2/
  test/clang-tidy/config-files.cpp
  test/clang-tidy/diagnostic.cpp
  test/clang-tidy/validate-check-names.cpp
  unittests/clang-tidy/ClangTidyOptionsTest.cpp
  unittests/clang-tidy/ClangTidyTest.h
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