Google Reader starred.json importer
Clean up Google Reader import code
Add Google Reader stars import info to readme
Fix Google Reader star import broken by 0a6ba413cb / efb6f315ae

Stories need an entry_id column based off the guid the feed supplies
Add test for starring unstarred items on Google Reader import
Notify for skipping feeds on Google Reader stars import and add test
Create story directly for importing Google Reader stars instead of ostruct
Make tests for Google Reader stars import order independent
Some cleanup

https://github.com/swanson/stringer/pull/221#discussion-diff-6644015
Merge branch 'tweak' of https://github.com/dperson/stringer into tweak
Merge branch 'import-stars' of https://github.com/rzhw/stringer into import-stars
Merge branch 'import-stars' into tweak