CLC-3783 Textbooks proxy does not use VCR
CLC-3783 Streamline old textbook tests before adding new support
CLC-3783 Add unit test support for textbooks with saved bookstore data
CLC-3783 Add test for error response from bookstore
CLC-3783 Handle ISBN-less textbooks
CLC-3783 Add test for choices of a required textbook
CLC-3783 Add dummy JSON feed for my/textbooks_details
CLC-3783 Display bookstore links. Inline texts-with-choices.
CLC-3783 New Cal store logo; protect tests against reordered pages
Merge pull request #2664 from raydavis/raywip

CLC-3783 Textbooks may include materials without an ISBN