Update cpplint.py to google#267:

- Handle parentheses in CHECK() calls properly.
- Fixed multiple false positives where various things like
  std::fucntion<> or function pointers were being mistaken for casts.
- Fixed whitespace warning on placement new.
- Fixed multiple false positives related to const references.
- Added warning for empty conditional bodies.
- Stop advising the use of readdir_r instead of readdir.
- Fixed false positive for empty macro arguments.
- Fixed false positvie for braced initializer lists.
- Don't warn about unnamed parameters in function pointers.

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Review URL: https://codereview.appspot.com/17400043