Fix booklist link, add redirect for books/new
Add check for authors when rendering book
Remove border-radius on top bar

Fixes #14.
Switch top bar to ``.navbar-static-top``

- Remove ``.topbar`` class
+ Add ``.navbar-static-top`` to top bar

Associated with issue #14
Fix #15 - changed footer link from relative

The link to ``/version`` in the footers is now absolute instead of relative.
Merge pull request #17 from zuzak/dev