Add DBpediaSpotlightClient.java back and rename translated to scala clients

This pull request fixes issue #239. By adding back the DBpediaSpotlightClient.java and rename the translated to scala clients (to be without Scala in their names).

The AnnotationClientScala.scala and the DBpediaSpotlightClientScala.scala can not be renamed, because the old java versions were not deleted (the first is the father abstract class and the second because it was requested as issue 239). And, so, if Scala was take off their names, as all clients both java and scala are in the same package it would generate a class name conflict.