Analytics: Record story-list events

Note when a story is opened, saved, moved,
or archived, to measure real-time activity
on the site.
Analytics: Add 'story' category and actions

The Google docs suggest things like
'button' as a category and 'click' as
an action, but I don't think this is
very useful, so now our category is
'story' and our actions are what is
done to the story.