Add spigot support, add dynamic path to server logs, correct a variable

I added spigot support to the server start sequence and the updater. I also merged in a change to allow a dynamic path for server log files (https://github.com/Ahtenus/minecraft-init/pull/157) and fixed some variables.

Also, the -XX:MaxPermSize=256M is there because Bukkit and Spigot tend to crash if that is not present.