jf: modify the updater script to support copying to destination

this allows to update stuff that is just a painful copy of the file
taken from sony,  modified to support jf-common
Change-Id: I44e768f4f18dfd66202dfc09401022e2f1589779
Merge pull request #19 from CyanogenMod/cm-10.1

jf: modify the updater script to support copying to destination