New unregistered players have access to EVERY /kit!

[Anna Bakker]

kicksword92 joined for the first time, logged in saying they had a lot of kits. I then asked them what kits and they said:

07:34 <@McObot> (MCS) <kicksword92> i have adminkit,admin,modkit,diamondtools,diamondarmour,goldtools,goldarmour,misctools,irontools

I asked them to use"/kit admin" and they then used it and got items such as gold swords, wood tools, gunpowder, arrows etc. all the items a admin could need for fixing things.

Soo.. new players can use all the kits including diamond armour and admin things. This isn't good.

[Riot]

"critical" would be "the server doesn't run". Please don't exaggerate priorities.

[Riot]

adding check for when player is in no groups at all. Resolves #168

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