Add ACCESS_SUPERUSER to permissions list

[williamtheaker]

Feature request: add support for ACCESS_SUPERUSER permission as supported by koush's Superuser app. [1]
This can be accomplished by adding this line to AndroidManifest.xml :

<uses-permission android:name="android.permission.ACCESS_SUPERUSER" />

[1] https://plus.google.com/103583939320326217147/posts/T9xnMJEnzf1