Remove old temp auth token logic
Merge branch 'master' of github.com:okfn/ckanext-glasgow
[#94] Delete file versions

As part of this changes the way versions are presented has been
improved:

 * Added a Versions button in the resource page
 * Handle guids
 * Display all field
 * Format Download button
 * Fix redirects

Delete button is only shown if the user has appropiate permissions