[1.4.x & 1.5.x] USPS Firstclass patch

[Qphoria]

DO NOT USE THIS IF RUNNING v1.5.1.3 OR LATER!!!!
DO NOT USE THIS IF RUNNING v1.5.1.3 OR LATER!!!!
DO NOT USE THIS IF RUNNING v1.5.1.3 OR LATER!!!!
DO NOT USE THIS IF RUNNING v1.5.1.3 OR LATER!!!!
THERE IS ALREADY AND UPDATED FILE IN LATER VERSIONS!!!!

This fixes the issue discussed here:
viewtopic.php?f=114&t=9199&start=20#p190845

Where firstclass services were not showing except for postcard. Now all firstclass options will show when the cart weight is less than 13oz.

I also added sorting lowest to highest

If using OpenCart 1.5.x
You only need this if running a version of 1.5.x older than 1.5.1.3

If using OpenCart 1.4.x
You SHOULD download the 1.4.x version as it is newer than the one in 1.4.9.6