Add TaxNumber to Objects::Contact
Add WIP feature for Contact creation
Implement Contact endpoint; contact creation feature no longer WIP :-)
Add bundler binstubs to .gitignore
Add WIP feature for fetching all tax rates
Add Boolean attrs to Xeroid::Objects
Add TaxRate object
Add Boolean attribute extractor to the deserialiser
Add TaxRate deserialiser
Add tax_rates to client; fetching tax rates feature no longer WIP
Add tax_type to LineItem