CLC-3059 - Textbooks: CalCentral finds no required books, but the bookstore shows one
https://jira.media.berkeley.edu/jira/browse/CLC-3059
Merge pull request #2008 from christianv/CLC-3059

CLC-3059 - Use http for bookstore proxy
CLC-3052 - Textbooks - if bookstore site is down, we need graceful handling
https://jira.media.berkeley.edu/jira/browse/CLC-3052
Merge pull request #2007 from christianv/CLC-3052

CLC-3052 - Handle bookstore site connection errors better