Switched from using horizontal rules to divide articles to
making each article a list item. This is invisible to graphical
browsers, but makes identifying posts and reposts much easier
in text browsers.
Implemented a new page that shows a status context, though I'm
calling it a "thread" in the UI because I think that makes more
sense for users. Also moved the action element from the notification
into the event info component itself because I also want to use it
to indicate when a status is a reply.
Created a new page that displays notifications and added it to the
global nav. Abstracted out the pagination methods from the timeline
controller and put it in a helper class. Abstracted out the event info
(account, timestamp, etc.) into its own component.