Third iteration of user story editing.

Todo:
estimate time field samo v primeru ko ni v sprintu
spodnji form clear in nanovo naloži
pri spreminjanju najprej potegni iz baze, uredi, nato shrani (not sure if i did that)
delete button na spodnjem formu + preveri če je uporabnik master (drugače disabli buttone al whatever)
merged spreminjanje_in_brisanje_uporabniskih_zgodb4 to master
Fixing server side UserStoryImpl and UserStory
Merge branch 'bozo_nima_brancha'