Merge pull request #764 from rustyswayne/master

Initial merge of 1.3.0 code in preparation for 1.3.0 release
Merge remote-tracking branch 'merchello/1.3.0' into 1.3.0
Merge remote-tracking branch 'merchello/1.3.0' into 1.3.0
Intial API work on the Avalara AvaTax provider
Merge pull request #768 from rustyswayne/1.3.0

Intial API work on the Avalara AvaTax provider
Initial work on the Get Tax and Cancel Tax methods.  Defines the Request and Response objects.
Merge pull request #769 from rustyswayne/1.3.0

Initial work on the Get Tax and Cancel Tax methods.