* adjusted models to reflect open stages for user and some
  fileds added (img, desc uuid passphare etc.)
* new view STAGE which now contains stages and allows to see
  only stage for user on which is currently user at

enhanced views of sifrovacky

See merge request djz.88/sifrovacky!1

* sifrovacky are now visible as ACTIVE, SUBSCRIBED, ARCHIVED
  at index page and home page