Added more clarifying comments about how to configure the build properties
Added more clarifying comments about how to configure the build properties

zilaiyedaren/zxing-iphone,joelind/zxing-iphone,joelind/zxing-iphone,zilaiyedaren/zxing-iphone,joelind/zxing-iphone,joelind/zxing-iphone,joelind/zxing-iphone,joelind/zxing-iphone,zilaiyedaren/zxing-iphone,zilaiyedaren/zxing-iphone,joelind/zxing-iphone,joelind/zxing-iphone,zilaiyedaren/zxing-iphone,zilaiyedaren/zxing-iphone,zilaiyedaren/zxing-iphone,zilaiyedaren/zxing-iphone