Basic functionality

- Setup Exporter class
- Posting to test server works
- SQL generator
- CSV generator
Complete data extractions methods
Extracted out BaseFunctionality
Changed token name
Added order status switch
Fixed a bug where 400 is returned when theres no data
Created manifest api
Added token support to all calls
Improved error messages
Added initialize method to set token
Updated error messages and added codes
Added currency code
Bug fixes and wrapped in money
Added readme