Feature/get rid off boost dependency (#136)

* Update googletest submodule to release 1.8.1

* Add status section for compiler configuration

* Add gitignore section

* Fix compiler flags for modern compilers

* Fix path doc description

* Fix recursion on some compilers due to wrong copy_part method used

* Fix clang-format, remove useless states, update style according to used ones

* Apply codestyle to all files

* Apply codestyle to leftovers sources

* remove boost files

* Add boost algorithms replacement

* Replace boost usage

* Fix inner type usings

* Fix string erase usage

* Rewrite find algorithm to non-const iterator

Author: Liastre