The Welcome page holds when the session tree is interacted with. Changed a
few for-loops to for-each loops for readability.
changes comment.
adds setter for tree panl.
changes tree structure. Sessions are not consistently retrieved from database.
removes auto-generated todos
stablize the overview tree
add 'new session' branch to the overview tree
refresh the tree after merging new incoming from database.
updates tree when a session is created.
updates tree when a session is opened or closed.
cleanly moves a session from 'open session' to 'closed session'
refactor codes.
Merge branch 'dev' into dev-tree-structure

Conflicts:
	PlanningPoker/src/edu/wpi/cs/wpisuitetcw/modules/planningpoker/controllers/GetAllDecksController.java
	PlanningPoker/src/edu/wpi/cs/wpisuitetcw/modules/planningpoker/controllers/get/session/GetAllSessionsController.java
	PlanningPoker/src/edu/wpi/cs/wpisuitetcw/modules/planningpoker/controllers/put/GenericPUTRequestObserver.java
	PlanningPoker/src/edu/wpi/cs/wpisuitetcw/modules/planningpoker/controllers/session/AddSessionController.java
	PlanningPoker/src/edu/wpi/cs/wpisuitetcw/modules/planningpoker/models/PlanningPokerSession.java
Merge pull request #102 from Team-Combat-Wombat/dev-tree-structure

Stabilize the tree structure on overview panel