Add a shariff-backend-java

Hey guys

we coincidentally worked on a sharecount clone in java which equals the API of your other backends. It would be nice if you could look into our project and add it to your list of backends.

Regards
Wormi
Merge branch 'patch-1' of https://github.com/globalworming/shariff into globalworming-patch-1
mark shariff-backend-java as provided by third party
Merge branch 'globalworming-patch-1'