code: protected final void copyFolder( File sourceFolder, File targetFolder ) throws MojoExecutionException
      {
          copyFolder( sourceFolder, targetFolder, TrueFileFilter.TRUE );
      }
docs: Copies the files contained within the source folder to the target folder.
  <p>
  The the target folder doesn't exist it will be created.
  </p>
  
  @param sourceFolder      Folder from which to copy the resources.
  @param targetFolder      Folder to which to copy the files.
  @throws MojoExecutionException if the files cannot be copied.