spree/spree_active_shipping — pull request #172 by mrpollo (2013-12-30 18:16:42+00:00)
Title: check if a package is shippable on available?

this change makes it easier for people to create their own calculators
and stops errors from happening when they previously forget to call
is_package_shippable? inside compute_package, there currently is a lot
of logic inside compute_package and the cleaner we keep it the better.

fixes #164
fixes #171