[ADD] Helper for /website/image (allows to use aggressive cache)
[IMP] Compress resized /website/image's

Refactored and fixed tools.image_resize_image() that converted to RGBA
after making thumbnails, resulting in bad looking picture in case the
source is in 'P' mode (indexed palette)
[IMP] Convert product demo png's to 8bit
[ADD] tools.image_save_for_web() helper for image compression
[ADD] Compress uploaded image by default

Added an opt-out option available from the button's dropdown