Task labels for multiple assignees

[jrubenoff]

Sometimes, multiple people collaborates on a task. For example, JG, Aidan and I are working on the competitor "war document". One of us might be working on it now, another might tackle it later, and it might not be on the third person's list. But if I add todo_upcoming to the task, Hubot will think all three of us are working on it next.

How do we get Hubot to understand the task's position in each person's to-do list?