KUAL extensions added (since kindlepdfviewer will soon support all devices)
remove unrequired scripts
update to direct referencing of scripts.
SIDE-EFFECTS: this means /mnt/us/kindlepdfviewer/kpdf.sh is now the REQUIRED location as opposed to preferred.
add extensions directory in customupdate
remove kite in favor of KUAL
Merge pull request #752 from houqp/new_ui_code

pick KUAL support files from master