Cpplint

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* Revert "Fix the `build/endif_comment` check", same as reverted in upstream

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* Cleanup release, fixes further issues with tests and source distribution

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* Cleanup release, only adds test support files to source dist

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* Incorporate cpplint updates from google (e5d807c6a0d, 2018-05-03)
* Fix the `build/endif_comment` check (https://github.com/google/styleguide/pull/169)
* Teach the explicit constructor check about constexpr (56)
* Changed vs7 output format (57)
* Remove presubmit check for DISALLOW_* macros (54)
* add `--quiet` flag as in upstream (https://github.com/google/styleguide/pull/293)
* support `--root` argument to run in different folder (https://github.com/google/styleguide/pull/291)
* Fix 16bit Unicode issue (https://github.com/google/styleguide/issues/337)

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* Incorporate cpplint updates from google (6d3a7d8a2, 2016-07-14)
* Add --headers flag to choose which extensions are header files.
* Add regression testing.

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* Fixes bug causing RValue detection with namespaces to fail.