Add FedEx Freight Priority and Economy to service types
Add additional address fields to location node
Add freight rate request support if options present [FedEx]
Fix FedEx unit tests given new location node builder
Add remote test for FedEx freight
Add unit test for FedEx freight rate request
Use more descriptive variable names for FedEx freight nodes
Refactor FedEx freight-specific request elements to their own functions
Merge pull request #118 from trxtraining/fedex-freight

Add support for FedEx freight economy and priority