Introducing easylogging++ as versatile logging framework

I've played around a little bit with [easylogging++](https://github.com/easylogging/easyloggingpp) and incorporated it with basic functionallity.
I think, macros have their right to exist in C++ code. Sometimes it's just a lot more handy to use macros. When you look at larger C++ codes such as Qt you'll find them quite regularly, especially, when it comes to logging or debugging utilities.