Upgraded from  0.6.1 to  0.6.8

CHANGE LOG 

Version 0.6.8
Fixed an incorrect intialization of $._spritely.instances that was causing the plugin to break.
Version 0.6.7
Removed the erroneous 'stop_after' key from the default options object.
The synonymous 'play_frames' option has now been fixed, and can be used to play only a set number of frames of animation. Note that this option only applies to sprite animations. It is used like so:
    $('#sprite').sprite({
        no_of_frames: 5,
        fps: 12,
        play_frames: 36 // Play through the animation three times and then stop.
    });
Fixed the 'do_once' option, which plays through the animation one time and then stops on the last frame (and works for both sprite and panning animations):
    $('#sprite').sprite({
        no_of_frames: 5,
        fps: 12,
        do_once: true
    });
Version 0.6.6
Fix an issue that causes the background image position to reset along the panned axis before animation begins.
Version 0.6.5
Better detection of 'background-position-x' CSS support
Fix incorrect use of clearInterval in $.fn.destroy()
Version 0.6.4
Added metadata information for plugins.jquery.com, and incrimented the version number. (No actual changes to Spritely.)
Version 0.6.3
Fixed an issue that caused the background of panning sprites to disappear on some browsers. This affects at least Firefox on 64-bit Windows 7. Offset values are now reduced to the smallest (correct) value possible on each update.
Version 0.6.2
Removed reliance on jQuery.browser; perform an actual feature check.