Add database.example.yml
fixes #33: search by isbn
a few enhancement
last check in---i hope---of nongeneric branding
moving things into a theme dir
implements #42 and fixes isbn13 lookup typo
make things themeable, implements a lot of #4
small usability tweak
dont display a button if book not in stock
make it possible to have longer descriptions on title lists
basic infrastructure for selling books
make text areas not insane
fixes #43
fixes #46
make invoicing easier
make discount sticky
small fix
small fix for great weirdness
Make it possible to receive Purchase Orders by Turning Outstanding titles into invoices
style tweaks