Indeed it's not working,
As exapained in the documentation I've changed the definition to 
`val executionContext = Akka.system.dispatchers.lookup("akka.actor.slick-context")`
and the application.conf of the sample app to : 

```
akka {
  actor {
    slick-context {
      fork-join-executor {
        parallelism-factor = 20.0
        parallelism-max = 200
      }
     }
   }
 }
```

If I display the thread name in a SlickAction the value is "specs2.DefaultExecutionStrategy1"

Did I miss something?

Thanks,
Loïc