Raise exceptions if API login and key not present
Create useful hooks to handle API errors

See README updates for details
Add additional checks for configuration
The Tax adjustment should only be created once.
  subsequent cals should update the amount
Merge branch '1-3-stable' of https://github.com/bluehandtalking/spree_tax_cloud into dupe_taxes

Conflicts:
	app/models/spree/order_decorator.rb
	app/models/spree/tax_cloud.rb
	app/models/spree/tax_cloud/tax_cloud_exceptions.rb
update dependencies
Prevent divide by 0 error by checking on the
cart_price.
enclose tax_cloud_adjustment in a begin block and rescue errors
Merge pull request #42 from urimikhli/dupe_taxes

Dupe taxes