Clarify appname getting

```getClass.getName.reverse.dropWhile(_ == '$').reverse``` too hard to understand
For my opinion, ```getClass.getName stripSuffix "$"``` is simpler.

Best solution: [scala.reflect.NameTransformer](http://www.scala-lang.org/api/current/index.html#scala.reflect.NameTransformer$). But it's too hard for this simple task.