Feature : Volume adjust sound preference 2/2

Adjusting the volume makes a nice "boing" sound
Personally I find this annoying
This patch makes this a preference in
Settings | Sound
    Volume adjust sound
        Play sound when adjusting volume with hard keys

The Checkbox is defaulted to ON (1 in defaults.xml)

Look at 1/2 for the Settings, Sound Panel Change
http://review.cyanogenmod.com/14722

Change-Id: I1113d62a5d99a1fe59f3c14362371af24d10b549

Conflicts:

	res/values/strings.xml
	src/com/android/settings/SoundSettings.java