Sprint Edit - Add tasks - version 1
- Sprint validation should be agains tasks rather than backlog items
- Ability to add remove backlog items to sprint backlog (no validation against sprint estimation)
- Sprints tasks as list view
- No check to disable 'remove' operation for backlogitem if tasks are already added

- Other changes
  - Fix all the list views (except User)
  - Fix item view to use panel-info for the title/description block
  - property bar directive - ability to arrange icons vertically
  - Fix notification alert alignment