IterationPlanningBoardApp was not unsubscribing on destroy. This was causing it to stick around and listen for messages even after the user navigated to other pages.
Merge pull request #72 from RallySoftware/mparrish_iteration_planning

IterationPlanningBoardApp was not unsubscribing on destroy. This was causing it to stick around and listen for messages even after the user navigated to other pages.