Settings: Add alternative screen-off animations (2/2)

Not everyone is keen on the electron beam screen-off animation. This allows
users to choose an alternative animation:

- Fade out
- Electron beam (default)
- Scale down

PS1: Update authorship

Change-Id: I0b92c4094d7def0c5491cd8baaec6a5887966565

Conflicts:
	res/values/pa_strings.xml
	src/com/android/settings/DisplaySettings.java