Initial commit of changing speed to velocity, and partial fix to closing game cases.
Initial commit to make game not start a new game unless the number of landers playing have landed.
Initial commit for controlling when game starts. Keydowns for two lander waits for second lander to land before starting new game.
Changed LunarLanderController handleRequestDescent to check for this.model.gameState is ==='waiting' instead of !== 'setup'
Changed LunarLanderController handleRequestDescent to check for this.model.gameState is ==='waiting' instead of !== 'setup'
Merge branch 'master' of https://github.com/concord-consortium/codap-data-interactives
Merge branch 'wip_close-lander-game'