Adds and uses a modified_by property in models/work.py
This property is used to display the user who last edited the work in the document viewer.
Fixes author being set on every edit.
Also edited the style-sheet to fix issue i128.
Patch by: Lennard de Rijk
# Please sort this file in alphabetical order by last (given) name.
# Please only include one name per line. If an (optional) email address is
# included, it must be RFC 2821 compliant (properly quoted, escaped, etc.).
# Lines beginning with # can be stripped from the file, as can blank lines.
"Todd Larsen" <tlarsen@google.com>
"Chen Lunpeng" <forever.clp@gmail.com>
"Sverre Rabbelier" <sverre@rabbelier.nl>
"Pawel Solyga" <pawel.solyga@gmail.com>