Fixes observer panel not adding JPanels to abstract class
Adds more tests to the Game Model to determine the validity of the model
Merge branch 'dev' of https://github.com/cs3733bdt/wpi-suite into dev

# By Jeffrey Signore (1) and Tianchang Gu (1)
# Via Tianchang Gu (2) and Jeffrey Signore (1)
* 'dev' of https://github.com/cs3733bdt/wpi-suite:
  Add getUsers method that returns the number of users in this game
  Changed the layout a ton. Top half of create game and active game views now resize with horizontal increases in window size. Bottom halves do not yet resize properly. Also centered and reformatted various components including panels, buttons, etc. Also, Jonathan showed me how to add a default main type for planningpoker active games panel so I dont need to run Janeway each time. Jeffrey Signore