evaluate 1.0.4

• evaluate() once again doesn't open a device if new_device = FALSE (#234)

• evaluate() uses ragg::agg_capture() if ragg is installed. This supports
  more modern graphics capabilities than pdf() and should generally be faster
  (#238).

• evaluate() now runs cleanup with interrupts suspended. This should ensure
  it works more reliably if you are using setTimeout().

• evaluate() no longer errors when capturing certain plots generated by
  grid (#244).