MANY CONSOLE FIXING

Many annoying admin console fixes.
Such as:
 * In case of expired session token, now an alert is shown and the console is reloaded
 * The session token is now automatically refreshed every 14 minutes
 * The links to download assets are fixed. The AppCode was missing in the querystring
 * A more "elegant" message is shown where an error is thrown by the server
 * A "Collection already exists" message is shown when a collection is created twice
FIX THE COLLECTIONS DROPDOWN IN THE DOCUMENTS PAGE

There were some annoying bugs in the Documents page.

 * Clean the document's table when the page is shown
 * Added a "refresh" icon/button on the table header to reload the table