Add style checker for C/C++ using Google cpplint.py

If want to write code according to the [Google C++ Style Guide](http://google-styleguide.googlecode.com/svn/trunk/cppguide.xml), this will help a great deal.
For more information: [cpplint.py](http://google-styleguide.googlecode.com/svn/trunk/cpplint/cpplint.py)