Add range collapse support on from-date and to-date changes. Fix #59
Fix invalid left truncation
Allow moving outside of visible view
Fix moving task to another row
Allow going outside visible area while moving tasks from start/end
Fix invalid tasks size when fromDate or toDate changes
Display visual indicators when task is truncated
Forget previousColumns and nextColumns when regenerating columns.
Do display display tasks that exceeds the dateRange
Add task-out-of-range option
Remove useless code
Make task-out-of-range simpler
Hide scrollbars if not required
Add missing apply in labelsResizable directive
Fix typo in scope binding
Add width option (global width instead of columns width)