Forward port Quiet Hours settings

Change-Id: I57ad089a2b2f7d6ed3df773ca69ad67f7b8fe185

Conflicts:

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

	new file:   res/layout/preference_time_range.xml
	modified:   res/values/strings.xml
	new file:   res/xml/quiet_hours_settings.xml
	modified:   res/xml/sound_settings.xml
	modified:   src/com/android/settings/SoundSettings.java
	new file:   src/com/android/settings/cyanogenmod/QuietHours.java
	new file:   src/com/android/settings/cyanogenmod/TimeRangePreference.java