Adds ability to create and store planning poker sessions.
Will require reintegration when merged with GUI
Merge branch 'dev-new-session' of https://github.com/Team-Combat-Wombat/wpi-suite-tcw into dev-new-session

Conflicts:
	PlanningPoker/src/edu/wpi/cs/wpisuitetcw/modules/planningpoker/controllers/AddSessionController.java
	PlanningPoker/src/edu/wpi/cs/wpisuitetcw/modules/planningpoker/controllers/AddSessionRequestObserver.java