Add book list status to book pages

+ Add "You added this book" message to books pages that the user has already
  added
+ Add an "Add this book" message to book pages the user has not yet added
+ Allow ``/books/add/foo`` to auto-fill the addition input box
fix cover margin
Add links to API; add citations

* Refactor profile edit sequence to redirect back to profile instead of merely
  rendering it
* Add links to upstream API's edit pages
* Added ``showUpstream`` user preference to toggle those links
* Added basic Harvard citation for books
* Add attribution to Internet Archive on version page
remove shoddy dev output
Merge pull request #13 from zuzak/dev