[PATCH] [clang-tidy] Add support for custom configuration file names/formats.

[Alexander Kornienko]

Added/updated comments, moved the loop over config handlers inside
TryReadConfigFile.

http://reviews.llvm.org/D5821

Files:
  clang-tidy/ClangTidyOptions.cpp
  clang-tidy/ClangTidyOptions.h
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