spree/spree — pull request #3660 by swrobel (2013-08-30 00:26:13+00:00)
Title: 2 Migrations to ease in the upgrade from 1.3 -> 2.0

* Assign a shipping category to existing products & shipping methods if they don't have one
* Migrate old shipping calculators to the new ones and preserve their preferences

Fixes #3605

Should probably be merged into master as well