only one possible callback for each eventcode

[soul9]

I tried to add two joins to eventcode 001 and this is how i discovered the bug (the default callbacs that are set up in setupcallbacks only add maximum one callback for each eventcode).

[soul9]

I feel like a map[string]map[int] is simpler to use than a slice, so i modified it and it fixed the issue. The diff can be found on http://gist.github.com/618127 (now multiple events for the same event code work as expected)

[thoj]

Thanks.. I fixed it in master. I did it a bit differently though.