Merge pull request #7 from rterbush/fixup

Fix a cut and paste issue.
Merge pull request #9 from rterbush/2-0-stable

Port to Spree 2.0 and add support for +4 address verification and tax calculation
zip +4 in tax_cloud.rb
Merge terbush pull #9
Updates for Spree 2.0 & Making RSpec actually run.
Merge pull request #10 from jdutil/specs

Updates for Spree 2.0 & Making RSpec actually run.
Adding order#promotions_total to order_decorator.rb
Removing tax_cloud from gemspec
Remove comment on requiring spree_promotion_tax in order_decorator.rb
Merge branch 'master' of github.com:bluehandtalking/spree_tax_cloud
Reverting to: taxable = ( cart_price + order.promotions_total )
Restoring tax_cloud to gemspec for verify address
Adding tags to .gitignore
Adding *.orig to .gitignore
Revised merge from rterbush
Update README
Fixes engine.rb to call activate for decorators.  Also begin to cleanup code formatting.
Merge pull request #13 from jdutil/master

Fixes engine.rb to call activate for decorators, formatting cleanup.
Fix usps address verification bug, and origin address bug.
Improve error handling during checkout & write some basic integration specs.