FedEx: Add option for development vs. production environments

[sahartash]

[vincentw56]

I just tried it with your address information and it worked fine. Currently, it looks like FedEx dev environment is having issues getting any other rate than Ground. Since I don't have your FedEx account information, I cannot tell if it is an issue with your account. If you set a break point in the FedExProvider.cs file at line 136 (I think), you can check any replies coming back. Here is a screenshot:

You can also download the files from FedEx and use it to make sure it is working.

https://www.fedex.com/us/developer/web-services/process.html?tab=tab2

[carlosredondo]

We experienced this same bug, and we found that Fedex integration wasn't returning rate information because Fedex class provider was configured to use production URL as default.

[kylewest]

closed by #51