def clean(backtrace, kind = :silent)
      filtered = filter_backtrace(backtrace)

      case kind
      when :silent
        silence(filtered)
      when :noise
        noise(filtered)
      else
        filtered
      end
    end
def clean(backtrace, kind = :silent)
      filtered = filter_backtrace(backtrace)

      case kind
      when :silent
        silence(filtered)
      when :noise
        noise(filtered)
      else
        filtered
      end
    end
Returns the backtrace after all filters and silencers have been run
 against it. Filters run first, then silencers.