Optimize bandwidth usage of updateChallenges
Optimized team sending

Teams are now sent using our new packTeam/unpackTeam code, rather
than JSON. This compresses teams from an average of 2000 bytes to
an average of 500 bytes.
Version 0.9.2

(The new team format is an incompatible change)
Merge remote-tracking branch 'upstream/master'
Merge branch 'master' of http://github.com/FrPSServ/Pokemon-Showdown