working indicator

Where is the indicator used?:
- on batch update.
- on every attempt to fetch a collection. To see it you would need to set bootstrapped data to false in /public/app/browseWorks.js : 146;
- while saving an edited work
This must be indented, otherwise the footer ends up outside the HTML tag.  View the page source in the browser!  It's not pretty that the footer is in the content div, but then the content div must move out of include/top.jade and be provided by the page jade instead.