Use Wordspec for all tests

It was discussed and team agreed we'd rather have consistent tests even
if the compilation is slightly slower.

build.sbt

@@ -446,10 +446,3 @@ def akkaModule(name: String): Project =
     .settings(akka.Formatting.formatSettings)
     .enablePlugins(BootstrapGenjavadoc)
 
-lazy val typedTests = taskKey[Unit]("Runs all the typed tests")
-typedTests := {
-  (test in(actorTyped, Test)).value
-  (test in(actorTypedTests, Test)).value
-  (test in(clusterTyped, Test)).value
-  (test in(clusterShardingTyped, Test)).value
-}