Put cookbooks task in supermarket:import namespace
Split category import from cookbook import
Remove unused CSV parsing helper
Extract database configuration, which is URL-based
Fill out the task to import cookbook dependencies
Extract CookbookDependencies import class
Move almost everything out of import.rake
First stab at a user import.
Add task to import cookbook following records
Associate cookbooks with their owner
Speed up user import

This changes the way we iterate over community site user records so that
we only iterate over those that have not yet been imported
Cookbooks task depends on users task
Update cookbook maintainer when importing metadata
Autorequire the Import namespace
Add an :all task
Skip Followings with orphaned User records
Skip PlatformVersions with orphan CookbookVersions
Import Cookbook Collaboration records
Preserve Collaborator record timestamps
Preserve cookbook/cookbook version timestamps