Game can no longer be created with a start date in the past

The system now checks whether the start date is in the past when the 'Create Game' button is pressed.
Changed tree names to 'New', 'Open', 'Closed' to make it more clear what is what

Contributors: bnurbekov, mamora, sfmailand
Merge branch 'sbl-dev' of git://github.com/struct-by-lightning/wpi-suite into sbl-dev
Merge remote-tracking branch 'origin/sbl-dev' into sbl-dev

Conflicts:
	PlanningPoker/src/edu/wpi/cs/wpisuitetng/modules/PlanningPoker/view/NewGameTab.java
Merge pull request #101 from sfmailand/sbl-dev

Changed tree names to 'New', 'Open', 'Closed' to make it more clear what is what