Use only CSS for close button and loading image.

Based on code from Augustus Kling <augustus.kling@gmail.com>
HTML5 compliance: Use class instead of rel attribute to mark images.
Initial take on fitWindow.
Initial support for walking between pages.
Initial swipe support.
Increase speed of image switching.
Shrink image border from 10 to 2 pixels wide.
Move label and close button to within image.