added Task package/folder

git-svn-id: http://pxncommon.googlecode.com/svn/trunk@14 f5fbd6b6-c213-558c-f92f-5ab434f62466
moving pxnTask class into Task package/folder

git-svn-id: http://pxncommon.googlecode.com/svn/trunk@15 f5fbd6b6-c213-558c-f92f-5ab434f62466
moved one instance allowed check to pxnJavaPlugin class
finished pxnTask class - abstract layer for BukkitScheduler
  mostly finished pxnTaskThrottled - just needs throttling code added
added errorMsgs string list to store errors
  plugin loaded ok if errorMsgs is empty

git-svn-id: http://pxncommon.googlecode.com/svn/trunk@16 f5fbd6b6-c213-558c-f92f-5ab434f62466
fixing a few minor things from last commit

git-svn-id: http://pxncommon.googlecode.com/svn/trunk@17 f5fbd6b6-c213-558c-f92f-5ab434f62466