MultiValue - Values and Titles from delegate

When creating the InAppSettings plist we sometimes do not know what the values and titles for a multi values section are. This branch adds to new methods to IASKSettingsDelegate:

-(NSArray *)settingsViewController:(IASKAppSettingsViewController*)sender valuesForSpecifier:(IASKSpecifier *)specifier;
-(NSArray *)settingsViewController:(IASKAppSettingsViewController*)sender titlesForSpecifier:(IASKSpecifier *)specifier;