Refactored FoA and FedEx to use correct settings. Refactored constants in Fedex. Created and got usps working
Merge pull request #710 from koswesley/USPS-1.3.0

Refactored FoA and FedEx to use correct settings. Refactored constants i...
Several fixed rate API-related functions removed from shipping.controller.js, modifications made to the addeditmethod dialog to unify fixed & non-fixed shipping providers.
Merge remote-tracking branch 'merchello/1.3.0' into 1.3.0
Major refactor of Shipping page. Removed most (possibly all) fixed rate specific api calls. Add/Edit shipping method dialog now working (mostly) with new combined API.