Add container listing helper

This might be useful if we want to let the user select the container
to show.
Remove duplicated removeClass call
Animate loading text

Instead of a static background image, the text "Loading..." is now
displayed while the title and thumbnail is loaded. The "..." is
animated. When the thumbnail is loaded, the text faded away.
Show object count in header
Remove funny colors depending on who updated what
Show events in a log file at the bottom of the screen
Smaller log over AJAX requests