Refactoring tasks controller: remove unused session key.
Refactoring tasks controller: remove unused session key.

rafaspinola/jobsworth,digitalnatives/jobsworth,rafaspinola/jobsworth,xuewenfei/jobsworth,xuewenfei/jobsworth,xuewenfei/jobsworth,webstream-io/jobsworth,rafaspinola/jobsworth,ari/jobsworth,ari/jobsworth,digitalnatives/jobsworth,ari/jobsworth,webstream-io/jobsworth,digitalnatives/jobsworth,webstream-io/jobsworth,ari/jobsworth,rafaspinola/jobsworth,digitalnatives/jobsworth,webstream-io/jobsworth,xuewenfei/jobsworth,digitalnatives/jobsworth