[PATCH] Config file support for clang-format, part 2.

[Alexander Kornienko]

  Use llvm::sys::path::append + SmallString. Print .clang-format file name on error. Output BasedOnStyle in -dump-config.

Hi djasper, klimek,

http://llvm-reviews.chandlerc.com/D758

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D758?vs=1861&id=1876#toc

Files:
  include/clang/Format/Format.h
  lib/Format/Format.cpp
  tools/clang-format/ClangFormat.cpp
  unittests/Format/FormatTest.cpp
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