Fixed warnings in ViewSessionInfo: added serialization field and gettter
Changed notifications to use UserStash. jakehaas
Fixed notifications to properly send to all users in the database. Notifications are also now sending on session closure. jakehaas
Updated the message text that users recieve. jakehaas
Updated tests to reflect changes to notification system. jakehaas
Merge remote-tracking branch 'origin/dev-fixNotifications' into dev

Conflicts:
	PlanningPoker/src/edu/wpi/cs/wpisuitetcw/modules/planningpoker/controllers/session/ActivateSessionController.java
	PlanningPoker/src/edu/wpi/cs/wpisuitetcw/modules/planningpoker/view/overviews/viewSessionComp/ViewSessionInfoPanel.java