Revert "Remove unused code: ApplicationHelper#task_icon(task) method."
Revert "Remove unused code: ApplicationHelper#task_icon(task) method."

This reverts commit 009ceab06df3056e7c8459e68630cf97ce617d3b.

xuewenfei/jobsworth,webstream-io/jobsworth,digitalnatives/jobsworth,webstream-io/jobsworth,rafaspinola/jobsworth,ari/jobsworth,webstream-io/jobsworth,ari/jobsworth,evinoca/clockingit,digitalnatives/jobsworth,arunagw/clockingit,evinoca/clockingit,evinoca/clockingit,rafaspinola/jobsworth,rafaspinola/jobsworth,digitalnatives/jobsworth,xuewenfei/jobsworth,rafaspinola/jobsworth,evinoca/clockingit,digitalnatives/jobsworth,webstream-io/jobsworth,digitalnatives/jobsworth,ari/jobsworth,ari/jobsworth,xuewenfei/jobsworth,xuewenfei/jobsworth,arunagw/clockingit,arunagw/clockingit