Merge pull request #9 from lettergram/master

Added book lists to users
Merge pull request #10 from lettergram/master

Fixed a couple bugs and only share the "id" of each book (to save space)
Merge remote-tracking branch 'upstream/master'
Added file downloads for book collection.
Maxed book collection to 5 books for the moment.
Cleaned up some stuff, relating to file downloads