Prefill parameters update/Queue position race condition

Some minor changes:
1. Fixed race condition with gamesByStatus:pending on game creation. Queue position ordering could mismatch game creation ordering when multiple games were created concurrently because 2 timestamps were created during creation instead of 1.
2. Added number_of_players to prefillParameters.json.dist because the prefill script failed to create games otherwise.
3. changed name from "2048" -> "Flappy Bird"