CLC-3410 Move Textbooks classes to app/models/textbooks
CLC-3410 Rename TextbooksProxy->Proxy
CLC-3410 Put Textbook classes into Textbooks module
Merge pull request #2233 from christianv/CLC-3430

CLC-3430: Alert messages are appearing on CFV and Textbook list print jo...
Merge pull request #2234 from ctweney/clc-3410-4

CLC-3410 Fourth batch of proxy reorg: Textbooks
Merge pull request #2231 from christianv/CLC-3356

CLC-3356: Splash page: Add fade at top
Merge pull request #2232 from christianv/CLC-3364

CLC-3364: Capture analytics for the print button
CLC-3313: Textbooks: Google Play links have a very high "not found" rate
https://jira.ets.berkeley.edu/jira/browse/CLC-3313