Bad assembly strategy

[pomadchin]

Right now the build.sbt file has a not fully correct assembly strategy, it should be replaced by

assemblyMergeStrategy in assembly := {
  case "reference.conf"   => MergeStrategy.concat
  case "application.conf" => MergeStrategy.concat
  case PathList("META-INF", xs @ _*) =>
    xs match {
      case ("MANIFEST.MF" :: Nil) =>
        MergeStrategy.discard
      case ("services" :: _ :: Nil) =>
        MergeStrategy.concat
      case ("javax.media.jai.registryFile.jai" :: Nil) | ("registryFile.jai" :: Nil) | ("registryFile.jaiext" :: Nil) =>
        MergeStrategy.concat
      case (name :: Nil) if name.endsWith(".RSA") || name.endsWith(".DSA") || name.endsWith(".SF") =>
        MergeStrategy.discard
      case _ =>
        MergeStrategy.first
      }
  case _ => MergeStrategy.first
}

Since the current version can confuse users, and doesn't take into account GeoTrellis SPI merge.