scalatra assembly include other dirs

build.sbt

resourceGenerators in Compile <+= (resourceManaged, baseDirectory) map { (managedBase, base) => 
  val webappBase = base / "src" / "main" / "webapp" 
  for { 
    (from, to) <- webappBase ** "*" x rebase(webappBase, managedBase / "main" / "webapp") 
  } yield { 
    Sync.copy(from, to) 
    to 
  } 
} 

resourceGenerators in Compile <+= (resourceManaged, baseDirectory) map { (managedBase, base) => 
  val webappBase = base / "resources"
  for { 
    (from, to) <- webappBase ** "*" x rebase(webappBase, managedBase / "resources") 
  } yield { 
    Sync.copy(from, to) 
    to 
  } 
}