+ fixed hfItemRestUrlExtraParams value get always getting set correctly in CategoryPicker
+ changed itemPicker selector for hfItemRestUrlExtraParams back to $('#hfItemRestUrlExtraParams_' + controlId). $('#' + controlId + ' [id*="hfItemRestUrlExtraParams"]') was returning "undefined" for me.  I tried in both Firefox and IE, and $('#hfItemRestUrlExtraParams_' + controlId) works. Maybe it was changed to try to fix the issue in CategoryPicker?