added helper script to download latest bukkit and crafft bukkit (dev,beta,rb). see lib/update_cb.sh for the script
fix for sync vs async running, no longer blocking or at risk of concurrentmodificationexceptions (hopefully). not exactly known if this is the best way to do it, but was the one that seemed to be the most clear. if anyone knows of a better way, pull request away\!
Merge branch 'master' of github.com:RobertZenz/org.bonsaimind.bukkitplugins