Renaming of both source packages and maven groupId. Issue #14.

Here the big refactor. All changes work and should pass tests. I greped in the end to see if drochetti was still around and there are just a few occurences left (in docs, developper section of pom, etc.).

I think that there has been some kind of glitch in that commit and I may have added integration tests that you might not have merged up to now ??

Any how everything works fine.