New: get(X|Y)Offset separated into current/anchor functions

getCurrentX/YOffset now gets the current offset for the current page

getX/YOffset now has an anchor parameter that will get the offset for anchoring the page to any combination of the four corners and/or two centers

Refs #231
Fixed: reverted accidental change and solved bug

-Had accidentally left some code in gotoPageTop in testing state, switched back now

-Added Events listener for updating panel size as potential solution to #235

Also refs #231