Rendering in JSP instead of Javascript

All backlog views will now be rendered on the server in JSP instead of locally using Javascript when opening a new view. After updating some items, causing a reload, it will however still fall back to Javascript rendering. The need of falling back to Javascript will be removed in a later change by @ChristofferL. 

Also switched date format for dateArchived and dateCreated.
Finally fixed a bug where it was not possible to switch between views when the backlog was sorted on one of the story specific attributes.