photo album major iteration

- lazy load the photo album tab in order to prevent too much image
  loading due to autoplay.
- hacked generated WOW slider html to make the background transparent
- config WOW slider gallery with: 64x64 thumbnails, 640x480 images,
  autoplay but loop once, Mellow template, stack transition effect,
  preserve aspect ration but shrink/stretch, on-demand image loading