PA 3.91 / PaPrefs working / No root

until root has been fixed we better cut it out lest it overwrites
users preferences. PA 3.91 releases must link to 3rd party root zips
for now.

Change-Id: I2b382271b55b984a7ba0a42de08e64315c2396e8
Merge branch 'jb43' of git://github.com/ParanoidAndroid/android_vendor_pa into jb43