Add served to gitignore
Add served to gitignore

JaredKerim-Mozilla/leaderboard-server,mozilla-services/location-leaderboard,JaredKerim-Mozilla/leaderboard-server,JaredKerim-Mozilla/leaderboard-server,mozilla-services/location-leaderboard,JaredKerim-Mozilla/leaderboard-server,mozilla-services/location-leaderboard,JaredKerim-Mozilla/leaderboard-server,mozilla-services/location-leaderboard,mozilla-services/location-leaderboard