Setup gradle

Hi, I wanted to try your library but I think your local environnement configuration was not like mine and I never get it to work. To avoid that I re-configure the entire project with gradle and I include the gradle wrapper. I also removed some eclipse files and some old maven configuration files (I guess). I hope it can help! :-).
In the future I will create a dependancy in a mvn repo on my github to be able to use it without having to include the source code in my project.