assign user and completion date alerts

changes made to allow updating of a user to a story and alert user if a
story is overdue
update story and create story screens updated

as above
move a story forward if a dependency is not complete
BackLog

new screen to show backlog and a button to go from main screen to
backlog
backlog

ability to add stories to a backlog (into database with column id = 0)
backlog

div with a list of backlog stories shows in the backlog page
dependent stories

get stories to show a list of their dependent stories