Finally, a place for notification settings.

Consolidated under the new Notifications settings are:

  - Ringtone (from Sound)
  - Zen Mode (from Sound)
  - Pulse LED (from Display)
  - Heads-Up Notifications (from Display)
  - Notification Access (from Security)
  - Show when locked (from Security)

Change-Id: I214d03ba1e356e088323a3058d98d390b8a8f988

src/com/android/settings/Settings.java

@@ -86,6 +86,7 @@ public class Settings extends SettingsActivity {
     public static class PrintSettingsActivity extends SettingsActivity { /* empty */ }
     public static class PrintJobSettingsActivity extends SettingsActivity { /* empty */ }
     public static class ZenModeSettingsActivity extends SettingsActivity { /* empty */ }
+    public static class NotificationSettingsActivity extends SettingsActivity { /* empty */ }
 
     public static class TopLevelSettings extends SettingsActivity { /* empty */ }
 }