Added two new commands to init script

[jketcham]

I've added two new commands to the init script: "whitelist reload" and "clear."

Whitelist reload is to just reload a server's whitelist while the server is running, which I don't believe was happening if you added or removed a player from the whitelist while the server was running.

The clear command is to clear a players inventory completely or just of a certain entity.

Since this is my first real contribution I hope everything is correct, I'd love pointers on this to get it working!

[marcuswhybrow]

I've had a look, and I'll merge in the changes when I get a chance to do so.

My instinct tells me that the whitelist reload command is not necessary, since when the server is running, the console `/whitelist add craftysaurus' would be used, and that circumvents the need to reload from file. However we could definitely add it as a useful command.

[jketcham]

Ahh I see, I wasn't sure if when you add someone to the white list while the server is running they'd be able to join right away. Makes sense now though.