Add metrics-graphite 3.0.2

I hope I did everything right.
Oops, except one thing - I cannot repush the same version to rubygems.
When I run `gem yank metrics-graphite-jars -v 3.0.2`, the response is `The version 3.0.2 does not exist.`
When I run `gem yank metrics-graphite-jars -v 3.0.2 -p java`, the response was at first `Successfully yanked gem: metrics-graphite-jars (3.0.2-java)`, then `The version 3.0.2 has already been yanked.`
When I run `gem push metrics-graphite-jars-3.0.2-java.gem`, the response is `Repushing of gem versions is not allowed.
Please use ```gem yank``` to remove bad gem releases.`
You should probably put yourself here :smile: