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- README
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Multiplayer pong!

We assume that users will not cheat

Frontend
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JSON messages:

all don't strictly need the player field, can infer from server side

Leaves a screen
{type:"screen", player:#id, direction:"left" or "right" or "topo", 
 location:{x:#, y:#}, velocity:{x:#,y:#}, geometry:{w:#,h:#}}
Bounces
{type:"bounce", player:#id, velocity:{x:#,y:#}}
End Game
{type:"drop", player:#id}
Score change
{type:"score", player:#id, score:#}