Add foundation for new library app

Adds the initial data model, migrations, urls, templates and views for the new library app
Add the new library appliation to installed apps and url
Update the book templates to show author and remove text from picture box
Update url for books to be more semantic
Merge status and book models
Add email field to reservation model
Update reservation object to use current time
Fix error where book id wasn't cast to string
Add for for book reservations
Add templates and url routing for book reservations
Update models and migrations
Update url generation for book reservations
Remove hard coded status values from views
Compress migrations
Add blank fields to model fields
Compress migrations into one
Delete test file as requested
Heroku and Amazon S3 configuration
SECRET_KEY is now an env var.
Merge pull request #17 from PinPinIre/library

Library feature