Fixed bug with FileUpload and empty values.
Add a loading cursor while ajax is in flight

Fixes #208
Render the working_copy if there is no published node

Not really correct, but what other choice do we have?  Normally this
will only happen when an admin is previewing an unpublished page, so
it's ok to show them the working copy.
Merge pull request #217 from fusionbox/empty_file_field_error

Fixed bug with FileUpload and empty values.
Fix urlconf include login_required handling

When a urlpattern matches but the view returns a 404, we shouldn't try
to redirect to login. This is done by checking if the url resolves
before and after the login_required pages are added. Only if it does not
resolve before but does after should we redirect to login.
Patch fancybox to work with jQuery 1.9

jQuery removed $.browser