Integrates cpplint as a target and a series of tests

This fork aims at integrating cpplint (open source lint-like tool developed by Google, designed to ensure that C++ code conforms to Google's coding style guides) the same way it was done for cppcheck.

- [x] tested on a small project

Known issues:
- what should be the default cpplint options? Should they be customizable by means of CMake variables?
- tests are not working (similar to issue cppcheck's issue #148 )

Yes, and no. We didn't actually decide of anything about the options we should use and it is wide open for discussion (see first bullet point above). It is only a biased default setting, because I found ccplint too picky on that point ("discourage streams, use printf everywhere"). Free to anyone to make me change my opinion.