Update AM730 viewer to adapt source change in 2014.

Major change in the source include:
1. AM730 only serve small and big size of image, not the middle size
2. Regardless of the image size, each page will has only one single
image. (AM730 used to break the big images into small pieces...)
3. URL for each page is much simplier than before.

Chnage in AM730 Viewer:
1. As there will be only one image per page, the html for displaying
   each page is reduced to just one img tag.
2. New source is big and slow, image preload mechanism is implemented.
3. There are two size levels, small and big
4. Chnage to use hash instead of query string for parameter passing,
   also parameter will shown in the url when page is changed.
Consider all 4XX response code as fail

Previous, only 404 is counted as fail.