3.0.2

Refactored code and added final commit of tax in payment. (acreilly)
Added model SpreeAvataxCertified::Address to handle formatting addresses for tax calculation
Added model SpreeAvataxCertified::Line to handle formatting lines for tax calculation
Removed commit avatax finalize from order state to complete and moved it from payment state to complete
Added cancel tax to payment state to void

3.0.1

Refactored cart adjustments out in favor of a TaxCalculator class. (acreilly)
Added a gem versioning system to match branch names. Spree branch 3-0-stable is tracked by gem branch 3-0-stable and point releases within that branch are semantically versioned.