Renamed menu.py to menus.py to avoid collision

Having difficulties with import menu in menu.py, therefore
renamed file to menus.py to avoid collision and plural
fits better in Django app folder, where all files are plurals
(urls.py, models.py, views.py etc).
Reformatting and added closing li element
Further formatting
Adding AUTHORS file now that we have another contributor
Bumping version
Updating changelog
Bump version in docs
Add new authors file to the manifest