Fixed potential resource leak and added some more java docs
Added mywarp.warp.sign.create.all permission
Refactored and cleaned up permissions and changed several permissions.
To use sign warps players need the mywarp.warp.sign.use permission,
permissions for (un)invitation player was changed to
mywarp.warp.soc.invite and mywarp.warp.soc.uninvite. To use help,
players need the mywarp.basic.help permission.