Add /nextrestart to KitchenSink

Hello,

I've added the code for /nextrestart to KitchenSink. This should cause it to be accurate, even if a tech does a /reloadaliases in CommandHelper. 

Adds one config option: next-restart. Should be the number of seconds between restarts. 

Also updated pom.xml to use the 1.6.2 bukkit build.

Thanks!