Backup and book search

I still want to make significant changes to the app structure, but at this point you can back up and restore your data from Dropbox, and you can search the Google Books API for book info instead of having to input it all manually.

Initial release

This is a stable release, but has no ability to back up data, and the fields saved will likely change a great deal. Luckily, I'm the only person that will ever use this, so no real worries here.