** Added error page for internal errors
** Added statics for error navigations rules
** Changed login screen to ask for login when needed
** Changed LoggedInInterceptor to redirect user into login page when
user is not logged in
** Changed workspace materials view to ask for login when user is not
logged in
** Changed material reading and management views to require logged user
Merge branch 'FTR-44_material-editor' of https://github.com/otavanopisto/muikku.git into FTR-44_material-editor