worlduniting/bookshop — Issue #2: add BOOK_VERSION for versioning method
Author: worlduniting
Created: 2011-11-25 18:12:26+00:00
State: open

User should have a BOOK_VERSION file in their project which is used to manage the book's version number.

E.g.

User edits BOOK_VERSION

```ruby
module Bookshop
VERSION = "0.0.1"
end
```

When user issues 'bookshop build epub' the build should be named 'build/epub/book_0.0.1.epub'.