Remove unused imports

public/shiva/src/main/scala/nl/lumc/sasc/biopet/pipelines/shiva/Shiva.scala

 package nl.lumc.sasc.biopet.pipelines.shiva
 
-import htsjdk.samtools.SamReaderFactory
 import nl.lumc.sasc.biopet.core.config.Configurable
-import nl.lumc.sasc.biopet.core.summary.SummaryQScript
-import nl.lumc.sasc.biopet.core.{MultiSampleQScript, PipelineCommand}
-import nl.lumc.sasc.biopet.extensions.Ln
-import nl.lumc.sasc.biopet.extensions.picard.{AddOrReplaceReadGroups, SamToFastq, MarkDuplicates}
-import nl.lumc.sasc.biopet.pipelines.mapping.Mapping
+import nl.lumc.sasc.biopet.core.PipelineCommand
 import org.broadinstitute.gatk.queue.QScript
-import scala.collection.JavaConversions._
 
 /**
  * Created by pjvan_thof on 2/24/15.