Update cpplint.py to google#296:

- Check for NUL bytes in the file.
- Fixed many false positives related to brace initialization.
- Improved accuracy of parsing reference template parameters.
- Added support for C++11 raw strings.
- Added CUDA extensions to those allowed by cpplint.
- Added check for incomplete namespaces.
- Silence warnings for missing spaces after comma due to elided
  comments.
- Rephrased some messages so that they're actionable.
- Fix false positive on namespace qualified function pointer arguments.
- Fix false positive for operators which return strings.
- Revive the VLOG check.

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Review URL: https://codereview.appspot.com/17450043