TODO
Introduce Player object

This object holds the visits now (instead of the session)
and is created from the data of the session (game and name).
Merge branch 'master' of github.com:githubnemo/wikirace-serv

Conflicts:
	game.go
	main.go
Clean up wiki stuff

Mainly substitute 'host' with 'url'. Also put the initialization
code to init().