Fix citation styling
Test for empty lists before rendering partials
Do not add space after every period

A more sophisticated regexp would be required so that urls, for
instance, are not destroyed.
Update styling for citation
Update gems
Add feature to edit books

This will allow us to remove RailsAdmin, which is not compatible with
Ruby 2/Rails 4, and is really too big for our needs.
Add conditional versioning

Versions are now created only after a specified period has elapsed, or a
specified difference in the word count is present.
Fix old reference to 'publishable' (now 'cited')
Fix sanitising of citations

Parentheses are now left in place.
Add features and routing specs for editing books
Add feature to edit links