0.37.0 — ImageLightbox `capNatural` accepts a multiple

Added

• ImageLightbox's capNatural now takes a number as well as a boolean.
  true still caps the open fit at 1:1 (100%); a number caps at that multiple of
  the source's natural resolution (capNatural={2} = up to 200%). This allows a
  small source to open a little larger than native without being upscaled all the
  way to the viewport. Backward compatible — the boolean form is unchanged.