ticket:8 add dummy template tag
ticket:8 add tag test 2a)
ticket:8 add 2b test
ticket:8 use simple tag

it'll be easier and we didn't need a lot of features
ticket:8 some clean-up
ticket:8 template tag - type checking done
ticket:8 add test if tag raises exc on unsaved obj
ticket:8 add id checking in tag

to avoid wrong rendering of fresh-created unsaved objects
ticket:8 fix test typo
ticket:8 add tag realization
ticket:8 refactoring: use 'reverse' for admin link
ticket:8 refactoring: pass to tpl object instead of dict

tag requires object, not dict, to be rendered
iticket:8 add tag into template
ticket:8 ooops... copy'n'paste error

isn't detected by unittests
Merge branch 't8_tag'