add cyanogenmod's quiet hours 1/2

...

 On branch jb422
 Changes to be committed:
	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

Change-Id: I27cd82294f430f81dfd231a8522ee99bb62651bc