Code 39 Barcodes Generated Backwards

Code 39 barcodes generated by zxing seem to be backwards. In other words, they appear to be rotated 180 degrees. For example, here is a Code 39 barcode from the Wikipedia entry for Code 39:

![393px-code_3_of_9 svg](https://f.cloud.github.com/assets/3630377/2247070/2f312316-9d6b-11e3-8d86-3a25a50fbb78.png)

And here is the barcode ZXing generates:

![zxing_original_screenshot](https://f.cloud.github.com/assets/3630377/2247081/3b80e5e8-9d6b-11e3-8614-035b72527c21.png)

Here is the barcode generated by ZXing after the change in this request:

![zxing_pull_request_screenshot](https://f.cloud.github.com/assets/3630377/2247101/5b7d9224-9d6b-11e3-986b-11443b6d0ea4.png)