Change class vars to global vars to remove warning
Format code
Merge changes from Vance to get Manning book cover
Add gem rack-test
Fix error when content is nil for Apress
Update Apress test to use latest HTML and make it pass
Fix error in oreilly deal when image_url doesn't match
Fix oreilly test and switch to latest feed data
Test image URL in Manning test
Add test to Manning for when the fallback image is used