message: updated readme with detail on vertical gutter and vertical offset new options
diff: @@ -44,6 +44,8 @@ $( selector ).imageLightbox({
  button: false, // bool; show close button
  caption: false, // bool; show captions
  enableKeyboard: true, // bool; enable keyboard shortcuts (arrows Left/Right and Esc)
  + gutter: 10, // integer; window height less height of image as a percentage
  + offsetY: 0, // integer; vertical offset in terms of gutter
  lockBody: false, // bool; disables body scrolling when lightbox is open
  navigation: false, // bool; show navigation
  overlay: false, // bool; display the lightbox as an overlay
  