Use format for string formatting
Test that BookSpecimenFactory also creates the related book
Typo in test name
Testing if it's raise is enough
Better syntax for batch factory creation
Cleaner URL formatting in tests
Simpler specimen creation checks in tests
Use plural for specimen related name
Add comment to emphasize why we have null=True on Book.isbn
Import order
Merge pull request #49 from ideas-box/library

Add library app (fix #7 #10)
Add library app (fix #7 #10)
Add model.image field (cf #5)

This only cover the needs for a "call" image, i.e. an image
to be used mainly to illustrate the article in a list, and we
still need to manage images in the text, later.