Port to Package object input
Merge pull request #86 from rterbush/first-class-calc-port

Port to Package object input
Merge pull request #87 from rterbush/master

Change the base.rb active_shipping calculator to only do rate calculations for the stock_location
Allow order object to be passed in. We have shipping_method.id which
is required.
Merge pull request #89 from rterbush/splitship-order-master

Allow Spree::Order object to be passed in