GUI-1133: Show image status and progress on image landing page and image detail page

updated image progress display, added cancel for bundle operations. Fixed cache invalidation for images when bundling. Fixed bdmapping_editor json escaping

https://eucalyptus.atlassian.net/browse/GUI-1133
The `&& item.fake_id != None` snippet should simply be `&amp;&amp; item.fake_id`, right?  Python's json lib (or simplejson) will convert 'None' values to 'null' in JS.  Oh, and the double ampersands should be escaped here and elsewhere for XHTML compliance.