hopefully get specs2 green again

Author: SethTisue

configs/community.dbuild

@@ -268,6 +268,8 @@ build += {
       // makes a "configuration not public" error in specs2-scalaz go away.  I got the idea to
       // try it by googling that phrase and finding https://github.com/sbt/sbt/pull/2345
       "set every publishMavenStyle := false"
+      // https://github.com/etorreborre/specs2/issues/673
+      "set excludeFilter in (Test, unmanagedSources) in examplesJvm := HiddenFileFilter || \"StackIsolatedSpec.scala\""
     ]
   }