Merge pull request #26 from nilsi/master

closes #14: Avoid loosing data with accidental double click
Display week numbers in date picker

Updated the date pickers to display week numbers.
fixes sonyxperiadev/BacklogTool#22
Merge pull request #27 from fredrikpersson/master

Display week numbers in date picker
Save button

Every backlog item now got an individual save button.
Renamed some old code to story attribute names instead of effort, status and prio.
Work in progress, bugs are there, and my login credentials