Patch 1: Added requirements to tasks
Patch 2: Added a view similar to the user view to the task view
Patch 3: Add missing comments
Patch 4: Merge dev into this branch and solve merge conflict
Patch 5: add a drop-down menu to display requirements, not done yet!!!
Patch 7: now the requirement is partially working
Patch 8: Now the requirement can open the tab, but the view cannot jump to requirement module
Patch 9: fix comments and tabs
Change-Id: I5e0788caf2aa57e5f5215f69ae3e380e71466d7e